Structure of Methyl 2,5-dihydroxybenzoate
CAS No.: 2150-46-1
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CAS No. : | 2150-46-1 |
Formula : | C8H8O4 |
M.W : | 168.15 |
SMILES Code : | C1=C(O)C=CC(=C1C(OC)=O)O |
MDL No. : | MFCD00016464 |
InChI Key : | XGDPKUKRQHHZTH-UHFFFAOYSA-N |
Pubchem ID : | 75077 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
Num. heavy atoms | 12 |
Num. arom. heavy atoms | 6 |
Fraction Csp3 | 0.12 |
Num. rotatable bonds | 2 |
Num. H-bond acceptors | 4.0 |
Num. H-bond donors | 2.0 |
Molar Refractivity | 41.77 |
TPSA ? Topological Polar Surface Area: Calculated from |
66.76 ?2 |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.7 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
2.07 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
0.88 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
0.74 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
0.73 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
1.23 |
Log S (ESOL):? ESOL: Topological method implemented from |
-2.42 |
Solubility | 0.633 mg/ml ; 0.00376 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (Ali)? Ali: Topological method implemented from |
-3.1 |
Solubility | 0.133 mg/ml ; 0.000792 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-1.32 |
Solubility | 8.1 mg/ml ; 0.0482 mol/l |
Class? Solubility class: Log S scale |
Soluble |
GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
High |
BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
No |
P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) |
No |
CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
No |
CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
No |
CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-5.86 cm/s |
Lipinski? Lipinski (Pfizer) filter: implemented from |
0.0 |
Ghose? Ghose filter: implemented from |
None |
Veber? Veber (GSK) filter: implemented from |
0.0 |
Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
Muegge? Muegge (Bayer) filter: implemented from |
1.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
1.0 alert: heavy_metal |
Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
1.44 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
69% | With potassium carbonate; In methanol; chloroform; for 4.5h;Reflux; | Methyl 5-(benzyloxy)-2-hyd roxybenzoateOHOBnBr, K2003 C H Cl 3/C H 30 HTo a refluxed suspension of K2C03 (32.8 g, 238 mmol) in methanol (180 mL) andCHCI3 (350 mL) was then added a mixture of methyl 2,5-dihydroxybenzoate (10.0 g,59.5 mmol) and bromomethylbenzene (7.10 mL, 59.5 mmol) in methanol/CHCI3 (50mL/25 mL) drop wise over 30 minutes. The resulting mixture was stirred at reflux for another 4 hours. After cooling down and filtration, the filter cake was washed with CHCI3 (20 mL). The combined filtrate was concentrated under reduced pressure. The residue was redissolved in CHCI3 (200 mL), washed with HCI (1 N) (100 mL x 2). Theorganic was then washed with brine (100 mL), dried over Na2SO4, filtered, and concentrated. The residue was purified by silica gel column chromatography eluting with petroleum ether/EtOAc (8: 1) to give methyl 5-(benzyloxy)-2-hydroxybenzoate (10.6 g, 69.0%) as a white solid.1H NMR (500 MHz, DMSO-d6) ?10.09(s, 1H), 7.43 (d, J= 7.2 Hz, 2H), 7.40-7.36 (m,2H), 7.34-7.32 (2H, m), 7.23 (dd, J= 9.2, 3.2 Hz, 1H), 6.93 (d, J= 9.2 Hz, 1H), 5.06 (5, 2H), 3.88 (5, 3H). NOESY showed the desired product as well. |
69% | With potassium carbonate; In methanol; chloroform; for 4.5h;Reflux; | To a refluxed suspension of K2CO3 (32.8 g, 238 mmol) in methanol (180 mL) and CHCl3 (350 mL) was then added a mixture of methyl 2,5-dihydroxybenzoate (10.0 g, 59.5 mmol) and bromomethylbenzene (7.10 mL, 59.5 mmol) in methanol/CHCl3 (50 mL/25 mL) drop wise over 30 minutes. The resulting mixture was stirred at reflux for another 4 hours. After cooling down and filtration, the filter cake was washed with CHCl3 (20 mL). The combined filtrate was concentrated under reduced pressure. The residue was redissolved in CHCl3 (200 mL), washed with HCl (1N) (100 mL*2). The organic was then washed with brine (100 mL), dried over Na2SO4, filtered, and concentrated. The residue was purified by silica gel column chromatography eluting with petroleum ether/EtOAc (8:1) to give methyl 5-(benzyloxy)-2-hydroxybenzoate (10.6 g, 69.0%) as a white solid. 1H NMR (500 MHz DMSO-d6) δ 10.09 (s, 1H), 7.43 (d, J=7.2 Hz, 2H), 7.40-7.36 (m, 2H), 7.34-7.32 (2H, m), 7.23 (dd, J=9.2, 3.2 Hz, 1H), 6.93 (d, J=9.2 Hz, 1H), 5.06 (s, 2H), 3.88 (s, 3H). NOESY showed the desired product as well. |
69% | With potassium carbonate; In methanol; chloroform; for 4.5h;Reflux; | To a refluxed suspension of K2CO3 (32.8 g, 238 mmol) in methanol (180 mL) and CHCI3 (350 mL) was then added a mixture of methyl 2,5-dihydroxybenzoate (10.0 g, 59.5 mmol) and bromomethylbenzene (7.10 mL, 59.5 mmol) in methanol/CHCl3 (50 mL/25 mL) drop wise over 30 minutes. The resulting mixture was stirred at reflux for another 4 hours. After cooling down and filtration, the filter cake was washed with CHCI3 (20 mL). The combined filtrate was concentrated under reduced pressure. The residue was redissolved in CHCI3 (200 mL), washed with HCI (1 N) (100 mL x 2). The organic was then washed with brine (100 mL), dried over Na2SO4, filtered, and concentrated. The residue was purified by silica gel column chromatography eluting with petroleum ether/EtOAc (8: 1 ) to give methyl 5-(benzyloxy)-2-hydroxybenzoate (10.6 g, 69.0%) as a white solid. 1H NMR (500 MHz, DMSO-c/6) δ 10.09 (s, 1 H), 7.43 (d, J = 7.2 Hz, 2H), 7.40-7.36 (m, 2H), 7.34-7.32 (2H, m), 7.23 (dd, J = 9.2, 3.2 Hz, 1 H), 6.93 (d, J = 9.2 Hz, 1 H), 5.06 (s, 2H), 3.88 (s, 3H). NOESY showed the desired product as well. |
69% | With potassium carbonate; In methanol; chloroform; for 4.5h;Reflux; | To a refluxed suspension of K2CO3 (32.8 g, 238 mmol) in methanol (180 mL) and CHCl3 (350 mL) was then added a mixture of methyl 2,5-dihydroxybenzoate (10.0 g, 59.5 mmol) and bromomethylbenzene (7.10 mL, 59.5 mmol) in methanol/CHCl3 (50 mL/25 mL) drop wise over 30 minutes. The resulting mixture was stirred at reflux for another 4 hours. After cooling down and filtration, the filter cake was washed with CHCl3 (20 mL). The combined filtrate was concentrated under reduced pressure. The residue was redissolved in CHCl3 (200 mL), washed with HCl (1N) (100 mL*2). The organic was then washed with brine (100 mL), dried over Na2SO4, filtered, and concentrated. The residue was purified by silica gel column chromatography eluting with petroleum ether/EtOAc (8:1) to give methyl 5-(benzyloxy)-2-hydroxybenzoate (10.6 g, 69.0%) as a white solid. 1H NMR (500 MHz, DMSO-d6) δ 10.09 (s, 1H), 7.43 (d, J=7.2 Hz, 2H), 7.40-7.36 (m, 2H), 7.34-7.32 (2H, m), 7.23 (dd, J=9.2, 3.2 Hz, 1H), 6.93 (d, J=9.2 Hz, 1H), 5.06 (s, 2H), 3.88 (s, 3H). NOESY showed the desired product as well. |
63% | With potassium carbonate; In acetone; at 20℃; | (Step 1) To a mixed solution of methyl 2,5-dihydroxybenzoate (10.0 g), potassium carbonate (12.3 g) and acetone (100 ml) was added benzyl bromide (7.43 ml), and the mixture was stirred overnight at room temperature. After the insoluble material was removed by filtration, the mother solution was concentrated. The obtained residue was purified by column chromatography (LL, Biotage cartridge, ethyl acetate:n-hexane=1:9→1:5) to give methyl 5-benzyloxy-2-hydroxybenzoate (9.63 g, 63%) as colorless crystals. |
53% | With potassium carbonate; In methanol; chloroform; at 70℃; for 3h; | [00287] To a solution of Example 18a (11.0 g, 65.47 mmol) in CHCl3/MeOH (300 mL/150 mL) was added K2C03 (27.0 g, 196.41 mmol). Then BnBr (11.0 g, 65.47 mmol) was added into the mixture at 70C and the mixture was stirred at the same temperaturefor 3 h. The mixture was filtrated and the filtratewas concentrated under reduced pressure. The residue was purified by silica gel chromatography (Petroleum Ether/EtOAc = 100/1 to 10/1) to give the desired product Example 18b (9.0 g, yield 53%) as a white solid. LCMS [M+l]+ = 259.0 |
30% | With potassium carbonate; at 60℃; for 8h; | To a stirred solution of methyl 2,5-dihydroxybenzoate (1 g, 5.95 mmol) in chloroform and methanol, were added K2CO3 (3.3 g, 23.8 mmol) and benzyl bromide (0.85 mL, 7.14 mmol). The reaction mixture was then stirred for 8 h at 60 C. Upon completion of reaction, the mixture was concentrated under vacuum, diluted with water and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulphate and concentrated. The crude product thus obtained was purified by flash column chromatography to obtain methyl 5-(benzyloxy)-2-hydroxybenzoate (470 mg, yield: 30 %) as a colourless liquid.1H NMR (400 MHz, DMSO-d6): δ 10.09 (s, 1H), 7.43 (d, J = 7.2 Hz, 2H), 7.38 (t, J = 7.2 Hz, 2H), 7.33 - 7.29 (m, 2H), 7.24 - 7.21 (m, 1H), 6.93 (d, J = 8.8 Hz, 1H), 5.05 (s, 2H), 3.88 (s, 3H). LC-MS (m/z): 259.07 (M+H)+ |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
<strong>[2150-46-1]Methyl 2,5-dihydroxybenzoate</strong> (1 g) is dissolved in 10 mL of n-hexylamine. After overnight heating in an oil bath (60 C.), the mixture is cooled to room temperature. n-Hexylamine is removed under reduced pressure. The residue is dissolved in ethyl acetate and further extracted with 1 N HCl. The organic layer is extracted with saturated sodium bicarbonate and dried over anhydrous sodium sulfate. Solvent is removed under reduced pressure to yield the product as an off-white powder. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
74% | With N-chloro-succinimide; In N,N-dimethyl-formamide; at 20℃; for 2.5h;Inert atmosphere; | Methyl gentisate (4.62g, 27.5mmol) or 2-hydroxy-5-methoxy-benzoic acid methyl ester (5g, 27.5mmol) were dissolved in anhydrous dimethylformamide (38mL), respectively. N-Chlorosuccinimide (N-Chlorosuccinimide, 3.66 g, 27.5 mmol) was added to the solution separately. Under the protection of argon or nitrogen, react at room temperature for 2.5 hours respectively, and pour into water, Extract with ether, wash the ether phase with brine, and evaporate to dryness under vacuum. Then it was purified by silica gel column chromatography (ethyl acetate:hexane=1:10). Experimental results: Two intermediate products, 3-chlorogentisic acid methyl ester (4.11g, 74%) or 2-hydroxy-3-chloro-5-methoxy-benzoic acid methyl ester (4.38g, 74%) were obtained respectively . |
In N-chloro-succinimide; hexane; n-heptane; water; ethyl acetate; N,N-dimethyl-formamide; | a) Production of 3-chloro-2,5-dihydroxy-benzoic acid methyl ester Under nitrogen as a protective gas, 6.75 g (40 mMol) of 2,5-dihydroxy benzoic acid methyl ester is dissolved in 80 mL of anhydrous DMF. While stirring, one adds a total of 6.94 g (5.2 mMol) of N-chloro-succinimide (NCS) in portions at room temperature, whereby the reaction solution slowly turns red. After complete addition, one allows it to stir overnight (at room temperature) for completion of the reaction. The process of the chlorination can be carried about by DC (flow agent n-hexane/acetic ether 1:1), in which one evaluates the reduction of the educt fleck; the preparation is only processed if scarcely any educt is to be seen in the DC (optionally use yet additional NCS). For processing, the preparation is poured into the separating funnel onto 200 mL of water and extracted with a mixture of 200 mL of heptane and 200 mL of acetic acid ethyl ester. The organic phase is washed once again with approximately 100-200 mL of water, and the solvent is subsequently removed (increase bath temperature in the rotary evaporator up to approximately 70 C./15 mbar in order to remove remaining DMF). A brown solid substance (approximately 9 g) remains behind (if no solid substance but rather an oil separates, it must be absorbed again in n-hexane/acetic ether (1:1) and washed with water), which is recrystallized from 200 mL of n-heptane in the presence of approximately 10 mL of acetic acid ethyl ester (85 C. bath temperature in the rotary evaporator, extracted by stirring/crystallized at room temperature), and after drawing off and drying initially yields 2.4 g of a flesh-colored crystallisate. Over the course of an additional crystallisation from the original solution (concentration of the original solution to dryness, recrystallisation of the residue), an additional 2.4 g of product is obtained. One obtains 4.8 g (59% of the theory) 3-chloro-2,5-dihydroxy-benzoic acid methyl ester. Melting point: 126 C. MS (ES-): 201. 1H-NMR (300 MHz, CDCl3): δ (ppm)=3.96 (s, 3H); 4.61 (s, 1H); 7.15 (d, 1H), 7.24 (d, 1H), 10.86 (s, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium carbonate; In acetonitrile; at 85℃; for 96h; | A mixture of methyl 2,5-dihydroxybenzoate (5 g, 0.03 mole), 1,2-dichloroethane (30 ml), potassium carbonate (8.3 g, 0.06 mole), and acetonitrile (225 mL) were heated in an 85 C. oil bath for 4 days. The reaction mixture was filtered and concentrated on a rotary evaporator to give 6.78 g of 5-(2-Chloro-ethoxy)-2-hydroxy-benzoic acid methyl ester, as a white wax. NMR and analytical HPLC/MS were consistent with the indicated structure. 1.5 g of this material were added to a mixture of 2M ammonia solution in methanol and aqueous ammonium hydroxide (28%). After several days at ambient temperature HPLC/MS indicated conversion was complete. The reaction mixture was concentrated (cold), triturated with warm chloroform and collected on a Buchner funnel to give 1.3 g of 5-(2-Chloro-ethoxy)-2-hydroxy-benzamide. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
80% | With potassium carbonate; sodium iodide; In acetone; for 20h;Heating / reflux; | To a mixture of methyl 2,5-dihydroxybenzoate (34 g, 202 mmol), anhydrous K2CO3 (204 g, 1.476 mol) and sodium iodide (5 grams, 33.3 mmol) in anhydrous acetone (1000 ml) was added methyl chloroacetate (60.7 grams, 559 mmol) and refluxed for 20 hours. Acetone was distilled off and water (1500 ml) was added. Crude 4 was filtered, dried and recrystallized from toluene to give pure 4 (50.5 g, 80%) as a cream colored powder. The melting point was found to be 90-94 C. The structure was confirmed by NMR. 1H-NMR (CDCl3) 3.78 (s, 3H, ester), 3.80 (s, 3H, ester), 3.89 (s, 3H, ester), 4.59 (s, 2H, O2), 4.63(s, 2H, O2), 6.88 (d, 1H, Ar), 7.02 (dd, 1H, Ar), 7.32 (d, 1H, Ar) |
80% | With potassium carbonate; sodium iodide; In acetone; for 20h;Heating / reflux; | Example 10 2,5-Bis-methoxycarbonylmethoxy-benzoic Acid Methyl Ester (10) To a mixture of methyl 2,5-dihydroxy-benzoate (34 grams, 202 mmol), and anhydrous K2CO3 (204 grams, 1.476 mol), Sodium iodide (5 grams, 33.3 mmol) in anhydrous acetone (1000 mL) was added methyl chloro acetate (60.7 grams, 559 mmol) and refluxed for 20 hours. Acetone was distilled and water (1500 mL) was added. Crude 10 was filtered dried and recrystallized from Toluene to give pure 10 (50.5 grams, 80%) as a cream color powder. The melting point was found to be 90-94 C. The structure was confirmed by NMR. IH-NMR (CDCl3) δ 3.78 (s, 3H, Ester), 3.80 (s, 3H, Ester), 3.89 (s, 3H, Ester), 4.59 (s, 2H, OCH2), 4.63 (s, 2H, OCH2), 6.88 (d, 1H, Ar), 7.02 (dd, 1H, Ar), 7.32 (d, 1H, Ar). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
56% | With potassium carbonate; In water; N,N-dimethyl-formamide; acetone; | EXAMPLE 101 5-[[6-([1,1'-Biphenyl]-4-yloxy)hexyl]oxy]-2-hydroxybenzoic acid methyl ester A mixture of 1.0 g (6 mmol) of 2,5-dihydroxybenzoic acid methyl ester, 2.0 g (6 mmol) of 6-([1,1'-biphenyl]-4-yloxy)hexyl bromide and 1.24 g (9 mmol) of potassium carbonate in 50 ml of acetone and 5 ml of DMF was stirred at reflux for 27 hours. The solvents were removed at reduced pressure, water was added to the residue and the product was extracted with ethyl acetate. The dried extract was concentrated to a solid which was purified by chromatography on 40 g of silica gel using 50% toluene-hexane to give 1.4 g (56% yield, mp 91-92) of 5-[[6-([1,1'-biphenyl]4-yloxy)hexyl]oxy]-2-hydroxybenzoic acid methyl ester. The structure was confirmed by nmr and mass spectra. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sulfuric acid; In methanol; | EXAMPLE 1 4-[2'-Formyl-4'-(m-chlorophenylmethyloxy)phenoxy]butyronitrile (1) 2,5-Dihydroxybenzoic acid, 30 grams (0.195 moles), was heated to reflux with 10 ml conc'd. sulphuric acid in 500 ml methanol for 72 hours. Then it was neutralized with solid sodium bicarbonate and striped in vacuo. The product was extracted with ethyl acetate and the organic extract was dried and stripped in vacuo to give 29.8 grams of methyl 2,5-dihydroxybenzoate of >90% purity. | |
With sulfuric acid; In methanol; | A) A solution of 50 g (0.32 mole) of 2,5-dihydroxybenzoic acid in 260 ml of methanol, at 0 C., was combined with 33 ml of sulphuric acid. The resulting solution was heated to 70 C. under stirring. After 6 hours the reaction mixture was cooled to room temperature and concentrated to small volume under vacuum. The resulting oily layer was taken up with sodium hydroxyde 5N and extracted with ethyl acetate the organic layer was washed with water, dried over sodium sulphate and evaporated under vacuum, to provide 52 g of methyl 2,5-dihydroxybenzoate which were used in the next step as obtained. | |
3a Methyl 2,5-dihydroxybenzoate 2,5-Dihydroxybenzoic acid was converted to its methyl ester using catalytic sulfuric acid in methanol following the same protocol as for esterification 2c in 94% yield. mp 86.4-88.5 C. IR(KBr): cm-1 3346, 1684. |
In methanol; diethyl ether; | EXAMPLE 1 Methyl-2,5-dihydroxybenzoate 2,5-Dihydroxybenzoic acid (30 g) was added to methanol (100 ml) which had been acidified with hydrogen chloride gas. The solution was refluxed for 12 hours when the solvent was removed. The resulting solid was taken up in diethyl ether (200 ml) and washed with water (2*100 ml). The organic layer was dried over magnesium sulphate and the solvent removed under vacuum. The resulting solid (30 g) (m.p. 83-84 C.) was identified as the desired methyl ester. | |
With sulfuric acid; In methanol; | A) A solution of 50 g (0.32 mole) of 2,5-dihydroxy-benzoic acid in 260 ml of methanol, at 0C, was added with 33 ml of sulphuric acid. The resulting solution was heated to 70C under stirring. After 6 hours the reaction mixture was cooled to room temperature and concentrated to small volume under vacuum. The obtained oily layer was taken up with sodium hydroxyde 5N and extracted with ethyl acetate. the organic layer was washed with water, anhydrified over sodium sulphate and evaporated under vacuum. Thus 52 g of methyl 2,5-dihydroxy-benzoate were obtained which were used in the next step as such. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
72% | With potassium carbonate; In N,N-dimethyl-formamide; acetone; | EXAMPLE 47 2-Hydroxy-5-(octadecyloxy)benzoic acid methyl ester A mixture of 1 g (5.95 mmol) of 2,5-dihydroxybenzoic acid methyl ester, 1.98 g (5.95 mmol) of 1-bromooctadecane and 0.825 g (5.95 mmol) of potassium carbonate in 20 ml of acetone and 1 ml of DMF was stirred at reflux for 20 hours. The usual workup followed by purification by HPLC using 1% ethyl acetate-hexane gave 1.8 (72% yield, mp 61-64) of 2-hydroxy-5-(octadecyloxy)benzoic acid methyl ester. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | With potassium carbonate; In water; acetone; | EXAMPLE 58 2-Hydroxy-5-(octadecyloxy)benzoic acid methyl ester A mixture of 2.0 g (11.9 mmol) of 2,5-dihydroxybenzoic acid methyl ester, 4.55 g (13.1 mmol) of 1-bromooctadecane and 1.9 g (13.7 mmol) of potassium carbonate in 50 ml of acetone was stirred at reflux for 24 hours. The solvent was removed at reduced pressure and the residue was treated with water. The product was extracted with ethyl acetate and the dried extract was concentrated to a solid which was recrystallized from ethyl acetate-hexane to give 3.5 g (70% yield, mp 53-54) of 2-hydroxy-5-(octadecyloxy)benzoic acid methyl ester. Anal. Calcd for C26 H44 O4: C, 74.24; H, 10.54. Found: C, 74.45; H, 10.89. |
With sodium methylate; In methanol; | EXAMPLE 14 2-Hydroxy-4-n-octadecoxy benzoic hydrazide hydrochloride Methyl-2,5-dihydroxy benzoate 16.8 g. (0.1 m.) was added to sodium methoxide (5.9 g. 0.11 m.) in methanol (100 ml.). 1-Octadecyl bromide (33.4 g., 0.1 m.) was added slowly, and the reaction mixture refluxed for 18 hours. The mixture was poured into water and shaken with ether. The ethereal extracts were washed with water, dried with magnesium sulphate, and the solvent was removed to give crude methyl 2-hydroxy-5-octadecoxy benzoate (41 g.). Distillation under reduced pressure gave the pure ester (10 g.) which had a boiling point of 232-242C at 0.07 mm. Hg. pressure, and a melting point of 62-63.5C after crystallisation from ethanol. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium carbonate; In water; N,N-dimethyl-formamide; | EXAMPLE 3 Preparation of methyl 2-hydroxy-5-(3-trimethyl-silanylpropyloxy)benzoate To a mixture of methyl gentisate (16.8 g, 0.1 mol) and potassium carbonate (15.2 g, 0.11 mol) in 80 ml of DMF, under a nitrogen atmosphere at 80 C., was added chloropropyltrimethylsilane (16.6 g, 0.11 mol) dropwise over 20 minutes. The mixture was heated at 90 C. for 8 hours. It was cooled and poured into 200 ml of water. The mixture was extracted with diisopropyl ether. The organic phase was washed with water, dried over sodium sulphate and then concentrated. After chromatography on silica of the yellow oil obtained (eluent: 90/10 heptane/CH2 Cl2), 3.3 g of a clean fraction of methyl 2-hydroxy-5-(3-trimethylsilanylpropyloxy)benzoate were recovered. UV (ethanol) λmax =335 nm, εmax =4500 Elemental analysis for C14 H22 O4 Si calculated: C 59.5 H 7.8 Si 9.9 found: C 59.5 H 7.9 Si 9.7 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
39% | With potassium carbonate; In acetone; | EXAMPLE 62 2-Hydroxy-5-[6-[2,3-bis(phenylmethoxy)phenyl]hexyloxy]benzoic acid methyl ester A mixture of 1.00 g of 1-(6-iodohexyl)-2,3-bis(phenylmethoxy)benzene, 0.34 g of 2,5-dihydroxybenzoic acid methyl ester and 1.0 g of potassium carbonate in 30 mL of acetone was stirred at reflux for 17 hours. Workup as in Example 16 and chromatography on 60 g of silica gel using 1% ethyl acetate-toluene gave 0.42 g (39% yield) of 2-hydroxy-5-[6-[2,3-bis(phenylmethoxy)phenyl]hexyloxy]benzoic acid methyl ester as an oil. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
87% | With caesium carbonate; In acetonitrile; for 1h;Heating / reflux; | 50 mg (0.15 mmol) of (lZ)-2-bromo-l-[3-(4-fluorophenyl)isoxazol-5- yl]ethanon O-propyloxime obtained in PREPARATION l-(2), 74 mg (0.44 mmol) of methyl 2,5-dihydroxybenzoate and 95 mg (0.29 mmol) of cesium carbonate was stirred in acetonitrile solvent under reflux for 1 hour, and solvent was removed to obtain 55 mg <n="157"/>of the title compound using column chromatography in a yield of 87%.NMR: 1H-NMR(CDCl3) δ 1O.41(1H, s), 7.85~7.78(2H, m), 7.47~7.38(1H, m), 7.35(1H, s), 7.18-7.11(3H, m), 6.9O(1H, s), 5.05(IH, s), 4.32~4.30(2H, m), 3.94(3H, s), 1.82-1.79(2H, m), 1.02~0.99(3H, m)Mass(EI) 428(M++1) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
98% | Compound 2 (1.00 g, 5.98 mmol) in anhydrous DMF (30 mL) was added to a flask containing sodium hydride (60% dispersion in oil) (0.57 g, 23.7 mmol) in anhydrous DMF (5 mL) at 0 00. After 1 h at 0 00 allyl bromide (1.5 mL, 17 mmol) and tetrabutyl ammonium iodide (0.44 g, 1.2 mmol) were added and the reaction mixture was stirred for 16 h at 25 C. The reaction was quenched with saturated aqueous ammonium chloride (10 mL). Dilution with ethyl acetate (30 mL) was followed by successively washing with water (5 x 60 mL), brine (30 mL), drying over magnesium sulfate and concentration in vacuo. The crude compound was purified by silica gel flash column chromatography (DCM : ethyl acetate; 8:2) to afford 6 as yellow coloured oil (1.45 g, 98%). 1H NMR (CDCI3) O 7.39-7.35 (m, 1H), 7.02 (dd, J= 9.2, 3.2 Hz, 1H), 6.90 (d, J= 9.2 Hz, 1H),6.10-5.98 (m, 2H), 5.51-5.37 (m, 2H), 5.30-5.25 (m, 2H), 4.58-4.54 (m, 2H), 4.52-4.49 (m, 2H),3.89 (5, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | With triethylamine; In dichloromethane; at 23℃; for 1h;Cooling with ice; | 2-(Methoxycarbonyl)-l,4-phenylene dibenzoate (20)To an ice-cooled solution of 19 (10.0 g, 59.5 mmol) in CH2Cl2 (250 mL) was subsequently added dropwise Et3N (33.3 mL, 238 mmol) and a solution of benzoyl chloride (14.4 mL, 125 mmol) in CH2Cl2 (50 mL). The resulting mixture was then stirred at 230C for 1 h. The reaction mixture was washed with H2O (3 x 300 mL), brine (300 mL), dried over anhydrous MgSO4 and the solvent removed under reduced pressure. The crude dark oil was then triturated in petroleum ether 40-60 and the resulting solid collected by filtration to afford 20.6 g (92%) of 20 as an off- white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | With sulfuric acid; for 15h;Reflux; | Methyl 2,5-dihydroxybenzoate (19) To a solution of 2,4-dihydroxybenzoic acid (20.0 g, 0.13 mol) in MeOH (200 mL) was added concentrated H2SO4 (8.52 mL, 0.16 mol). The resulting mixture was then heated at reflux for 15 hours. After cooling, the reaction mixture was concentrated under reduced pressure and the residue taken up in Et2O (200 mL). The organic extract was then washed with H2O (3 x 200 mL), brine (200 mL) and the solvent removed under reduced pressure to afford 20.0 g (92%) of 19 as a white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
74% | With dmap; benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; In N,N-dimethyl-formamide; at 20℃; for 12h; | General procedure: A solution of compound 3, substituted methyl salicylate (4a-4t), 1-ethyl-3-(3-dimethyllaminopropyl)carbodiimide hydrochloride (EDC.HCl), N-Hydroxybenzotriazole (HOBt) and 4-dimethylaminopyridine (DMAP) in DMF (50 mL) was stirred for 12 h at room temperature. Then, compounds 5a-5t were obtained by subsequent purification with flash chromatography (acetate: petroleum ether = 1:5-1:2). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
> 99% | With lithium perchlorate; In cyclohexane; acetonitrile;Electrochemical reaction; heterogeneous continuous flow synthetic system; | General procedure: As shown in Scheme S1, Supplementary data, the reactor equipped with carbon felt electrodes (5.0 mm × 5.0 mm) as both anode and cathode, and PTFE fiber (0.02 m/m, 300 mg) as separation filter was filled with a small amount of electrolyte solutions (5 mL) composed of CH3OH, CH3CN, or CH3NO2 as typical polar organic solvents and 1.0 M LiClO4 as supporting electrolyte. Substrates 1, 3, 6, 11, 14, 17 (0.10 mmol) were dissolved in c-Hex (10 mL) with nucleophiles 4, 7, 9 (0.50 mmol), 12, 15 (2.0 mmol), respectively, which were then pumped into the reactor at 100 μL/min. The electrolysis was carried out under constant current condition (2.0 mA, ca. 3.0 F/mol) and c-Hex solutions that passed through the PTFE fiber were concentrated to afford the isolated desired products in high to excellent yield. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium carbonate; In water; acetone; for 5h;Reflux; | General procedure: Compounds 4-12 were synthesized according to this procedure. To a solution of (hydroxy)benzoates 1-3 (1 equiv) and dibromoalkane (3 equiv.) in acetone (6 mL) and H2O (2 mL), K2CO3 (4 equiv) was added. After stirring and refluxing for 5 h, the mixture was concentrated in vacuum and then diluted with CH2Cl2 and washed with water. The combined organic layer was dried over MgSO4, filtered and concentrated to give the crude product which was directly dissolved in acetone (6 mL) and H2O (2 mL), followed by the addition of NaN3 (5 equiv). After stirring and refluxing for 6 h, the mixture was concentrated in vacuum and then diluted with CH2Cl2 and washed with water. The combined organic layer was dried over MgSO4, filtered and concentrated to give the crude product which was purified by column chromatography. |
Tags: 2150-46-1 synthesis path| 2150-46-1 SDS| 2150-46-1 COA| 2150-46-1 purity| 2150-46-1 application| 2150-46-1 NMR| 2150-46-1 COA| 2150-46-1 structure
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