Structure of 39067-29-3
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CAS No. : | 39067-29-3 |
Formula : | C9H6N2O2S |
M.W : | 206.22 |
SMILES Code : | OC(=O)C1=CSC(=N1)C1=CC=CN=C1 |
MDL No. : | MFCD00052304 |
InChI Key : | FOQFGMAZUTUELM-UHFFFAOYSA-N |
Pubchem ID : | 736513 |
GHS Pictogram: |
![]() |
Signal Word: | Warning |
Hazard Statements: | H315-H319-H335 |
Precautionary Statements: | P261-P264-P271-P280-P302+P352-P304+P340-P305+P351+P338-P312-P362-P403+P233-P501 |
Num. heavy atoms | 14 |
Num. arom. heavy atoms | 11 |
Fraction Csp3 | 0.0 |
Num. rotatable bonds | 2 |
Num. H-bond acceptors | 4.0 |
Num. H-bond donors | 1.0 |
Molar Refractivity | 52.3 |
TPSA ? Topological Polar Surface Area: Calculated from |
91.32 ?2 |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.2 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
1.4 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
1.9 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
0.19 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
2.52 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
1.44 |
Log S (ESOL):? ESOL: Topological method implemented from |
-2.45 |
Solubility | 0.732 mg/ml ; 0.00355 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (Ali)? Ali: Topological method implemented from |
-2.92 |
Solubility | 0.247 mg/ml ; 0.0012 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-2.82 |
Solubility | 0.313 mg/ml ; 0.00152 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) |
Yes |
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 |
-6.56 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 |
0.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.56 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
0.0 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) |
2.6 |
* 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 |
---|---|---|
80% | Then, the ethyl-2-(pyridine-3-il)thiazole-4-carboxylate (5Og) was dissolved in the mixture solution of tetrahydrofuran and methanol (=1:1), potassium hydroxide (KOH) 10% solution 50 mi was added thereto and then the mixture was stirred for 3 hours. After the stirring, the mixture was neutralized with hydrochloric acid, so that solid was obtained. The solid was filtered, so that 2-(pyridine-3-il)thiazole-4-carboxylic acid (35g, yield=80%) was obtained, which was acid compound. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethanolamine;silica gel; In tetrahydrofuran; | EXAMPLE 229 1-(3-Amino-pyridin-2-yl)-3-(2-pyridin-3-yl-thiazol-4-yl)-urea TEA (0.27 mL, 1.94 mmol) was added to a solution of <strong>[39067-29-3]2-(pyridin-3-yl)thiazole-4-carboxylic acid</strong> (200 mg, 0.97 mmol) and 4A molecular sieves in THF (25 mL) under N2 at RT. (Pho)2PON3 (0.33 mL, 1.55 mmol) followed by 2-amino-3-aminomethylpyridine (265 mg, 2.43 mmol) was added and the resulting mixture was heated at reflux for 12 h. After cooling to RT, the heterogeneous mixture was decanted to remove the molecular sieves. The precipitate was collected and discarded. The filtrate was purified by chromatography on silica gel (CH2Cl2/MeOH, 95:5) to give a white solid. MS m/z: 313.8 (M+H). Calc'd for C14H12N6OS-312.36. | |
With triethanolamine;silica gel; In tetrahydrofuran; | EXAMPLE 229 1-(3-Amino-pyridin-2-yl)-3-(2-pyridin-3-yl-thiazol-4-yl)-urea TEA (0.27 mL, 1.94 mmol) was added to a solution of <strong>[39067-29-3]2-(pyridin-3-yl)thiazole-4-carboxylic acid</strong> (200 mg, 0.97 mmol) and 4A molecular sieves in THF (25 mL) under N2 at RT. (PhO)2PON3 (0.33 mL, 1.55 mmol) followed by 2-amino-3-aminomethylpyridine (265 mg, 2.43 mmol) was added and the resulting mixture was heated at reflux for 12 h. After cooling to RT, the heterogeneous mixture was decanted to remove the molecular sieves. The precipitate was collected and discarded. The filtrate was purified by chromatography on silica gel (CH2Cl2/MeOH, 95:5) to give a white solid. MS m/z: 313.8 (M+H). Calc'd for C14H12N6OS-312.36. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethanolamine;silica gel; In tetrahydrofuran; | EXAMPLE 172 1-[6-(Morpholin-4-ylmethyl)-pyridin-2-yl]-3-[(2-pyridin-3-yl)thiazol-4-yl]urea TEA (0.27 mL, 1.94 mmol) was added to a solution of <strong>[39067-29-3]2-(pyridin-3-yl)thiazole-4-carboxylic acid</strong> (200 mg, 0.97 mmol) and 4A molecular sieves in THF (25 mL) under N2 at RT. (PhO)2PON3 (0.33 mL, 1.55 mmol) followed by 2-amino, 6-morpholinylmethylpyridine (280 mg, 1.45 mmol) was added and the resulting mixture was heated at reflux for 12 h. After cooling to RT, the heterogeneous mixture was decanted to remove the molecular sieves. The precipitate was collected, rinsed with EtOAc and purified by chromatography on silica gel (CH2Cl2/MeOH, 95:5) to give a white solid. MS m/z: 397.1 (M+H). Calc'd for C19H20N6O2S -396.47. | |
With triethanolamine;silica gel; In tetrahydrofuran; | EXAMPLE 172 1-[6-(Morpholin-4-ylmethyl)-pyridin-2-yl]-3-[(2-pyridin-3-yl)thiazol-4-yl]urea TEA (0.27 mL, 1.94 mmol) was added to a solution of <strong>[39067-29-3]2-(pyridin-3-yl)thiazole-4-carboxylic acid</strong> (200 mg, 0.97 mmol) and 4A molecular sieves in THF (25 mL) under N2 at RT. (PhO)2PON3 (0.33 mL, 1.55 mmol) followed by 2-amino, 6-morpholinylmethylpyridine (280 mg, 1.45 mmol) was added and the resulting mixture was heated at reflux for 12 h. After cooling to RT, the heterogeneous mixture was decanted to remove the molecular sieves. The precipitate was collected, rinsed with EtOAc and purified by chromatography on silica gel (CH2Cl2/MeOH, 95:5) to give a white solid. MS m/z: 397.1 (M+H). Calc'd for C19H20N6O2S-396.47. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In dichloromethane; | EXAMPLE 12 To a stirred suspension of 2-(3-pyridyl)thiazole-4-carboxylic acid (0.56 g) and triethylamine (0.55 g) in methylene chloride (25 ml) was added pivaloyl chloride (0.33 g) in methylene chloride (5 ml) and the mixture was stirred for 2 hours. After the reaction mixture was cleared, 4-[3-(3-aminophenyl)phenyl]-2-(3-pyridylmethyl)-3-oxo-3,4-dihydropyrido[2,3-b]pyrazine (1.0 g) was added thereto and the mixture was stirred under reflux for 2 hours. The reaction mixture was washed with sodium bicarbonate solution and water, dried over magnesium sulfate and concentrated. Crude residue was chromatographed on silica gel (70 g, chloroform-methanol 100:1 as eluent) to give 4-[3-[3-[2-(3-pyridyl)thiazol-4-ylcarbonylamino]phenyl]phenyl]-2-(3-pyridylmethyl)-3-oxo-3,4-dihydropyrido[2,3-b]pyrazine as colorless crystals (0.48 g). mp: 199-200pbC. NMR (DMSO-d6, δ): 4.28 (2H, s), 7.38 (3H, m), 7.50 (2H, m), 7.60 (1H, dd, J=8, 5Hz), 7.70 (2H, m), 7.80 (1H, m), 7.85 (1H, m), 7.95 (1H, m), 8.20 (2H, m), 8.41 (1H, m), 8.48 (1H, m), 8.50 (1H, m), 8.58 (2H, m), 8.73 (1H, m), 9.40 (1H, s). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
8% | With N-ethyl-N,N-diisopropylamine; HATU; In N,N-dimethyl-formamide; for 20h; | EXAMPLE 81; Methyl [(6-ethyl-4-{4-[(2-pyridin-3-yl-1 ,3-thiazol-4-yl)carbonyl]piperazin-1 -yl}thieno[2,3- d]pyrimidin-2-yl)thio]acetateTo a mixture of the hydrochloride salt of Example 34 (0.105 g) in DMF (2.0 mL) in a 2 dram screw cap vial was added diisopropylethylamine (0.15 mL), 2-(3-pyridyl)-1 ,3-thiazole carboxylic acid (0.062 g), and HATU (0.15 g). The mixture was placed in a Lab-Line MAX Q2000 orbital shaker for 20 hours at which time the mixture was partitioned between brine and ethyl acetate. The layers were separated and the organic layer washed four times with brine, dried over anhydrous magnesium sulfate and concentrated. The residue was chromatographed on silica gel EPO <DP n="114"/>using ethyl acetate as eluent and recrystallized from acetone to give 0.012 g (8%) of the title compound: MS (ESI+) for C24 H24 N6 03 S3 m/z541.11 (M+H)÷. 1H NMR (CDCI3) δ 1.34 (t, 3 H), 2.87 (q, 2 H), 3.73 (s, 3 H), 3.92-3.98 (m, 8 H), 4.22 (m, 2 H), 6.9 (s, 1 H), 7.4 (m, 1 H), 8.09 (s, 1 H), 8.22 (m, 1 H), 8.7 (m, 1 H), 9.2 (m, 1 H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In N,N-dimethyl-formamide; | WORKING EXAMPLE 52 To a mixture of 2-methoxymethyl-4-(3,4,5trimethoxybenzoyl)piperazine hydrochloride obtained in Reference Example 6 (0.52 g), <strong>[39067-29-3]2-(3-pyridyl)thiazol-4-carboxylic acid</strong> (0.3 g), triethylamine (0.46 g) and N,N-dimethylformamide (3 ml) is added dropwise, while stirring under icecooling, diethyl cyanophosphonate (0.47 g). The reaction mixture is stirred at 0 C. for one hour, and then poured into ice-water, followed by extraction with ethyl acetate. The organic layer is washed with water, dried and concentrated under reduced pressure. The concentrate is purified by means of a silica gel column chromatography (eluent:AcOEt-CH2 Cl2 --CH3 OH=10:9:1) to give 2-methoxymethyl-1-[2-(3-pyridyl) thiazol-4-ylcarbonyl]-4-(3,4,5-trimethoxybenzoyl) piperazine. Recrystallization from ethanol gives colorless needles m.p. 149-150 C. Elemental analysis for C25 H28 N4 O6 S*1/3H2 O: Calcd.: C 57.90; H, 5.57; N, 10.80: Found: C 58.12; H, 5.52; N, 10 86: | |
With triethylamine; In N,N-dimethyl-formamide; | Working Example 52 To a mixture of 2-methoxymethyl-4-(3,4,5-trimethoxybenzoyl)piperazine·hydrochloride obtained in Reference Example 6 (0.52 g), <strong>[39067-29-3]2-(3-pyridyl)thiazol-4-carboxylic acid</strong> (0.3 g), triethylamine (0.46 g) and N,N-dimethylformamide (3 ml) is added dropwise, while stirring under icecooling, diethyl cyanophosphonate (0.47 g). The reaction mixture is stirred at 0C for one hour, and then poured into ice-water, followed by extraction with ethyl acetate. The organic layer is washed with water, dried and concentrated under reduced pressure. The concentrate is purified by means of a silica gel column chromatography (eluent: AcOEt-CH2Cl2-CH3OH = 10:9:1) to give 2-methoxymethyl-1-[2-(3-pyridyl)thiazol-4-ylcarbonyl]-4-(3,4,5-trimethoxybenzoyl)piperazine. Recrystallization from ethanol gives colorless needles m.p. 149-150C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sulfuryl dichloride; N,N-dimethyl-formamide; In chloroform; for 0.5h;Heating / reflux; | To 2-pyridin-3-yl-thiazole-4-carboxylic acid (CAS No. 39067-29-3, 500 mg, 2.4 mmol) in chloroform (10 mL) was added excess sulfuryl chloride (400 μL) and dimethylformamide (100 μL) and the reaction heated to reflux. After 30 minutes, the reaction was cooled to room temperature and the solvent removed under reduced pressure to provide 2-pyridin-3-yl-thiazole-4-carbonyl chloride as a solid which was used directly in the next reaction. | |
With thionyl chloride; In toluene;Reflux; | Stage 3: N-(2,2-Difluoroethyl)-2-(pyridin-3-yl)-1,3-thiazole-4-carboxamide 200 mg (0.97 mmol) of <strong>[39067-29-3]2-(pyridin-3-yl)-1,3-thiazole-4-carboxylic acid</strong> were initially charged in 5 ml of toluene, 807 mg (6.78 mmol) of thionyl chloride were added and the mixture was heated under reflux until a clear solution was present. After cooling and removing the solvent on a rotary evaporator, the residue obtained was taken up in toluene and concentrated again. The residue was taken up in 2 ml of acetonitrile, 94.3 mg (1.16 mmol) of N-(2,2-difluoroethyl)amine were initially charged in 2 ml of acetonitrile, and 125 mg (970 μmol) of N,N-diisopropylethylamine were added. The solution of the acid chloride in acetonitrile was added dropwise. The mixture was stirred at room temperature for 15 hours, water and ethyl acetate were added to the reaction solution, and the organic phase was removed. After concentrating, the residue was purified by means of medium pressure chromatography.Yield: 28.9 mg (10% of theory); HPLC-MS: logP (HCOOH)=1.18; mass (m/z): 270.1 (M+H)+;1H NMR (d6-DMSO): 3.65-3.80 (m, 2H), 6.00-6.30 (m, 1H), 7.55 (m, 1H), 8.40 (m, 2H), 8.70 (m, 2H), 9.25 ppm (m, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
To a mixture of <strong>[39067-29-3]2-(3-pyridyl)-1,3-thiazole-4-carboxylic acid</strong> (300 mg) in pyridine (5 mL) and DMF (5 mL) at ambient temperature was added CDI (248 mg). The mixture was heated at 40 C. for 2 hours, treated with 2,3-diaminobenzamide dihydrochloride (326 mg), stirred at ambient temperature for 16 hours and concentrated. The concentrate was heated in glacial acetic acid (20 mL) at 110 C. for 2 hours, cooled and concentrated. The concentrate was partitioned between ethyl acetate and sodium bicarbonate solution, and the solid that precipitated was filtered and washed with water and ethyl acetate. 1H NMR (DMSO-d6) δ 7.38 (t, J=7.8 Hz, 1H), 7.60-7.67 (m, 1H), 7.78 (d, J=7.8 Hz, 1H), 7.81 (brs, 1H), 7.90 (dd, J=7.46, 1.0 Hz, 1H), 8.44-8.50 (m, 1H), 8.74-8.76 (m, 1H), 8.74 (s, 1H), 9.29 (brs, 1H), 9.34 (d, J=1.7 Hz, 1H), 13.44 (brs, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; N-cyclohexyl-N'-β-(4-methylmorpholinium)ethylcarbodiimide p-toluenesulfonate; benzotriazol-1-ol; In chloroform; at 20℃; for 20h; | 2-(3-Pyridyl)thiazole-4-carboxylic acid (206 mg, 1 mmol) and 2-amino-benzamide (163 mg, 1.2 mmol) are mixed, and chloroform (10 ml) and pyridine (1.2 ml) are added. Then 1-hydroxybenzotriazole hydrate (230 mg) and 1-cyclohexyl-3-(2-morpholinoethyl)carbodiimide metho-P-toluene-sulphonate CAS[2491-17-0] (635 mg) are added, and the mixture is stirred at room temperature for 20 h. The solid is filtered off with suction and washed with ethyl acetate, water and again with ethyl acetate. Purification of the solid by preparative HPLC results in Example 1.1 as a white foam (58 mg).C16H12N4O2S, M=324.4, LC-MS (ZQ): Rt=0.89, m/z=325 [M+H]+. 1H-NMR (400 MHz, D6-DMSO): δ=7.16 (m, 1H), 7.57 (m, 2H), 7.84 (m, 2H), 8.27 (s, 1H), 8.40 (m, 1H), 8.54 (s, 1H), 8.71 (m, 2H), 9.32 (m, 1H), 13.3 (s, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate; In chloroform; at 20℃; for 70h; | Preparation of N-[5-(aminocarbonyl)-1-methyl-1H-pyrazol-4-yl]-2-(3-pyridinyl)-4-thiazolecarboxamide by amide coupling with HATU: 2-(3-Pyridyl)thiazole-4-carboxylic acid (82 mg, 0.4 mmol) and 4-amino-2-methyl-2H-pyrazole-3-carboxamide (56 mg, 0.4 mmol) are introduced into chloroform (3 ml) and pyridine (0.2 ml). Then HATU O-(7-azabenzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate (228 mg) is added, and the mixture is stirred in a closed vessel at room temperature for 70 h. The precipitated solid is filtered off with suction, washed with ethyl acetate, water and again with ethyl acetate and dried in vacuo. Purification of the solid by HPLC results in Example 1.16 as a white foam.C14H12N6O2S, M=328.4, LC-MS (ZQ): Rt=0.72, m/z=329 [M+H]+. 1H-NMR (300 MHz, D6-DMSO): δ=3.99 (s, 3H), 7.58 (m, 1H), 7.85 (br. s., 2H), 7.93 (s, 1H), 8.36 (m, 1H), 8.53 (m, 1H), 8.70 (m, 1H), 9.24 (m, 1H), 10.7 (s, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | The obtained 2-(pyridine-3-il)thiazole-4-carboxylic acid (20.6g, 0.20 mol) was dissolved in tetrahydrofuran (500ml), triethylamine (13. Ig, 0.20 mol) was then drop-added thereto. The mixture was slowly drop-added with 1.2 equivalent of ethylchloroformate (14.Ig, 0.13 mol) and then stirred for 30 minutes. Then, aniline (9.3g, 0.10 mol) and triethylamine (13.1 ml, 0.13 mol) were dissolved in N,N-dimethylformamide 1500 ml, which was then slowly drop- added to the mixture which was then further stirred for 3 hours. After completion of the reaction, the mixture was filtered and the reaction solution was concentrated, again dissolved in dichloromethane 1500 ml, washed with distilled water 500 mi, again washed with sodium hydrogen carbonate 500 ml, dried with anhydrous manganese (10Og), then filtered and concentrated to be crystallized into hexane and then again filtered, thereby providing N- pheny1-2-(pyridine-3-i 1 )thiazo1e~4-carboxamide 14. Ig (yie1d=70%) . |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
52% | Stage 2: 2-(Pyridin-3-yl)-1,3-thiazole-4-carboxylic acid 5.90 g (19.0 mmol) of ethyl 2-(pyridin-3-yl)-1,3-thiazole-4-carboxylate hydrobromide were dissolved in 2 ml of water, and 3.30 g (38.0 mmol) of 45% aqueous sodium hydroxide solution were added. After evolution of heat had ended, the mixture was left to react for two hours at room temperature. After cooling with ice-water, the precipitated solid was removed and, while cooling with ice, the reaction solution was adjusted to pH 4 with dilute hydrochloric acid. The precipitated solid was filtered off, washed with water and acetone, and dried under high vacuum. Yield: 2.03 g (52% of theory); HPLC-MS: logP (HCOOH)=0.35; mass (m/z): 207.0 (M+H)+; 1H NMR (d6-DMSO): 7.55 (m, 1H), 8.35 (m, 1H), 8.50 (s, 1H), 8.70 (m, 1H) 9.15 ppm (m, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
42% | In a 1 dram vial, 3-[3-(aminomethyl)-6-chloro-2-fluorophenyl]oxy}-5- chlorobenzonitrile (25 mg, 0.080 mmol), DIPEA (0.014 mL, 0.080 mmol) and 2-(3- pyridinyl)-1 ,3-thiazole-4-carboxylic acid (16.57 mg, 0.080 mmol) were dissolved in DMF (1 mL). HATU was added (30.6 mg, 0.080 mmol) and the solution stirred overnight. The reaction mixture was diluted to 2 mL with MeOH. Purification was accomplished by Reverse-Phase HPLC (water/acetonitrile with 0.1% TFA) to afford the title compound (0.021 g, 42%) as a white solid. 1H NMR (400 MHz, CDCI3;.' δ ppm 9.40 (br. s., 1 H), 8.75 - 8.86 (m, 1 H), 8.58 (d, 1 H), 8.34 (s, 1 H), 7.89 (t, 1 H), 7.81 (dd, 1 H), 7.35 - 7.41 (m, 1 H), 7.33 (t, 1 H), 7.26 - 7.31 (m, 1 H), 7.16 (t, 1 H), 6.99 (s, 1 H), 4.75 (d, 2 H). LCMS m/z 498.9 (M+1 ). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
73% | General procedure: Route 1: To a suspension of N-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI) (100 mg, 0.520 mmol) inTHF (5 mL) under Ar atmosphere were added 1-hydroxybenzotriazole(HOBt) (60 mg, 0.440 mmol) and the corresponding carboxylicacid (b-f) (0.400 mmol). After 30 min, 4-(benzo[e][1,2]azaborinin-2(1H)-ylmethoxy)-N-methylaniline (6) (106 mg, 0.400 mmol) followed by Et3N (121 mg, 167 lL, 1.20 mmol) were added at 0 Cand the mixture was allowed to warm to RT overnight (16 h). Thecrude mixture was then diluted with EtOAc (25 mL) and washedwith satd aq NH4Cl (3 25 mL) then brine (25 mL). The organicphase was isolated and dried over Na2SO4, filtered, and the solventwas removed in vacuo. The crude residue was further purified bygradient column chromatography (SiO2, flash, 0-100%EtOAc/heptane) to isolate the title compounds (2b-f) after solventremoval. |
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