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CAS No. : | 138-41-0 | MDL No. : | MFCD00007938 |
Formula : | C7H7NO4S | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | UCAGLBKTLXCODC-UHFFFAOYSA-N |
M.W : | 201.20 | Pubchem ID : | 8739 |
Synonyms : |
|
Chemical Name : | 4-Sulfamoylbenzoic Acid |
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
* 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 |
---|---|---|
95% | With sulfuric acid; for 8h;Reflux; | Commercially available, 73 4-sulfamoylbenzoic acid 5 (10mmol) was refluxed in dried 74 methanol with a catalytic amount of 75 conc. H2SO4 acid for 8h. After completion of the reaction, the mixture was poured into ice cold water and obtained precipitate was filtered and dried to give 11 methyl 4-sulfamoylbenzoate 6. 4.3.2 11 Methyl 4-sulfamoylbenzoate (6) (0035) White crystalline solid; yield 95%; mp: 148-150C; 1H NMR (DMSO-d6,400MHz):delta 3.87 (s, 3H, OCH3), 7.55 (s, 2H, NH2), 7.94 (d, 2H, Ar, J=8.4Hz), 8.12 (d, 2H, Ar, J=8.4Hz); LC-MS: m/z; 216 (M+1). |
93% | With sulfuric acid;Reflux; | Concentrated sulfuric acid (1 ml) was added dropwise to a mixture of 4-aminosulfonylbenzoic acid (2.010 g, 10 mmol) in methanol (60 mL) and reacted under reflux until TLC showed the reaction was complete.Then, the solvent was removed under reduced pressure, and the residue was added to an aqueous sodium hydroxide solution to adjust the pH 6-7.The mixture was then stirred and filtered to obtain 2.000 g of white solid with a yield of 93.0%. |
92% | With sulfuric acid; at 20℃;Reflux; | 4-Sulfamoyl-benzoic acid methyl ester; To a mixture of 5.16 g 4-carboxylbenzenesulfonamide in 150 ml. methanol was added 6.84 ml_ sulfuric acid. The mixture was refluxed overnight and cooled to room temperature. The mixture was evaporated to dryness and the residue was triturated with Et2O. The formed precipitation was filtered off, washed with Et2O and dried to give 5.2 gram (92%) of a white solid. 1H NMR (400 MHz, CDCI3) delta 3.90 (s, 3H), 7.59 (s, 2H), 7.97 (d, J=5.84 Hz, 2H), 8.15 (d, J=5.84 Hz, 2H). |
75% | With thionyl chloride; at 0 - 20℃; | To a suspension of 4-(aminosulfonyl)benzoic acid (500 mg, 2.5 mmol) in MeOH (2 ml) at O0C is added thionylchloride (0.2 ml, 7.4 mmol). The reaction mixture is stirred at rt overnight. When TLC confirms the total consumption of the starting acid, the solvent and excess thionyl chloride are removed under reduced pressure to afford 400 mg (75 %) of the title compound, which was used in the next step without any further purification. LC/MS: (ES+):215.9, (ES-):214.1. |
Reflux; Acidic conditions; | Tolylsulfonamide 10 (1.00mM) was first converted to 4-aminosulfonyl benzoic acid by refluxing its aqueous suspension with KMnO4 (3.00mM) to generate the corresponding carboxylic acid followed by refluxing its methanolic solution firstly in acidic condition and then in excess of hydrazine hydrate.37 Yield 74%, lit. mp: 230-232C, Obs. mp: 228-230C. | |
With thionyl chloride; at 0 - 40℃; for 2h; | To the solution of 4-sulfamoylbenzoic acid (200 mg, 0.53 mmol) inMeOH (8 mL) added SOCl2 (1348 muL, 1.84 mmol) at 0 C. The mixturewas stirred at 40 C for 2 h, and then concentrated. Ester (214 mg,1.00 mmol) and (Boc)2O (238 mg, 1.09 mmol) were dissolved in DCM(8 mL). Et3N (138 muL, 1 mmol) and DMAP (12.2 mg, 0.1 mmol) wereadded and the mixture was stirred at rt. for 1.5 h. The solution wasconcentrated and purified to afford methyl 4-(N-(tert-butoxycarbonyl)sulfamoyl)benzoate. DIBAL-H (2 mL, 2 mmol) was added slowly tomethyl benzoate (300 mg, 1.00 mmol) in DCM (8 mL) at -78 C and themixture was stirred at -78 C for 2 h. The reaction was quenched by MeOH (2 mL), and then warmed to 0 C and added 10% citric acidunder stirring. The mixture was extracted with DCM, and the organicswere washed, dried, concentrated and purified to afford 4-formylbenzenesulfonamide.Using 4-formylbenzenesulfonamide, thecompound 44 was obtained from 5 by the general procedure as above.To the solution of 44 (95 mg, 0.20 mmol) in DCM (4 mL) added TFA(300 muL, 0.04 mmol). The mixture was stirred at rt. for 1 h. The solutionwas adjusted to pH 7-8 by NaHCO3. The mixture was extracted withEA, and the organics were washed, dried, concentrated and purified toafford 17, 54% yield for five steps, 94.0% HPLC purity. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
95% | In methanol; hexane; dichloromethane; at 20℃; for 2h; | . To a stirred suspension of 4- [SULFAMOYL-BENZOIC] acid (25.0 g, 0.124 mol) in 4: 1 CH2CI2/MeOH at rt was added 1.0 M TMSCHN2 in hexane (175 mL), and the reaction mixture was allowed to stir for 2 h. The mixture was diluted with 1 N [NAOH] (100 mL) and CH2CI2 (150 mL), and the layers were separated. The organic layer was dried over [NA2SO4,] then filtered, and the solvent was removed under reduced pressure to afford the desired ester (25.2 g, 95%), which was used without further purification. 1H NMR (400 MHz, DMSO-d6) : 8.14 (d, J = 8.1 Hz, 2H), 7.96 (d, J = 8.1 Hz, 2H), 7.58 (s, 2H), 3.90 (s, 3H). |
95% | To a stirred suspension of 4-sulfamoyl-benzoic acid (25.0 g, 0.124 mol) in 4:1 CH2CI2/MeOH at rt wasadded 1.0 M TMSCHN2 in hexane (175 ml), and the reaction mixture was20 allowed to stir for 2 h. The mixture was diluted with 1N NaOH (100 ml) andCH2CI2 (150 ml), and the layers were separated. The organic layer was driedover Na2SO4, then filtered, and the solvent was removed under reduced pressure to afford the desired ester (25.2 g, 95%), which was used withoutfurther purification. 1H NMR (400 MHz, DMSO-c/6): 8.14 (d, J = 8.1 Hz, 2H),7.96 (d, J= 8.1 Hz, 2H), 7.58 (s, 2H), 3.90 (s, 3H). | |
In methanol; hexane; dichloromethane; for 2h; | A. 4-Sulfamoyl-benzoic acid methyl ester. To a stirred suspension of 4-sulfamoyl-benzoic acid (25.0 g, 0.124 mol) in 4:1 CH2Cl2/MeOH at rt was added 1.0 M TMSCHN2 in hexane (175 mL), and the reaction mixture was allowed to stir for 2 h. The mixture was diluted with 1 N NaOH (100 mL) and CH2Cl2 (150 mL), and the layers were separated. The organic layer was dried over Na2SO4, then filtered, and the solvent was removed under reduced pressure to afford the desired ester (25.2 g, 95%), which was used without further purification. 1H NMR (400 MHz, DMSO-d6): 8.14 (d, J=8.1 Hz, 2H), 7.96 (d, J=8.1 Hz, 2H), 7.58 (s, 2H), 3.90 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In methanol; | Step 2 Preparation of methyl [4-(aminosulfonyl)]benzoate To a solution of 4-(aminosulfonyl)benzoic acid (16 g, 79.6 mmol) (Step 1) in methanol (600 ml), conc. H2 SO4 (1.2 ml) was added and the mixture was heated at reflux for 4 days. The solvent was removed and washed with ether. The white solid (16.5 g, 96%) was used in the next reaction without further purification. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogenchloride; In methanol; | EXAMPLE 74 4-(Aminosulfonyl)benzoic acid methyl ester A slurry of 30.2 g (0.15 mole) of p-carboxybenzenesulfonamide in 500 ml of methanol was treated with 30 g of anhydrous hydrogen chloride and the mixture was heated at reflux temperature for 3 hr. The solution was concentrated under vacuum to give 32.3 g of white, crystalline residue. A 5.0 g portion of this residue was recrystallized from 25 ml of methanol to give 3.3 g of title compound as a white powder, mp 174-178 C. Analysis: Calculated for C8 H9 NO4 S: C, 44.65; H, 4.22; N, 6.51. Found: C 44.80; H, 4.30; N, 6.47. | |
With potassium hydroxide; In diethyl ether; water; | 8(a) 4-Sulfamoyl-benzoic acid methyl ester. To a solution of KOH (108 mg, 2.0 mmol) in water (1 mL) was added Et2O and cooled to 0 C. MNNG (292 mg, 1.99 mmol) was added and the resulting yellow solution was added to a suspension of 4-Sulfamoyl-benzoic acid in Et2O at room temperature and stirred overnight. The reaction was quenched with acetic acid and the resulting mixture was diluted with water. The mixture was then extracted with ethyl acetate and the combined organic extracts was washed with bine and dried over Na2SO4. Removal of solvent gave the crude product which was used in the next reaction without further purification. 1H NMR (400 MHz, MeOD) delta 8.17 (d, 2H), 8.00 (d, 2H), 3.92 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
86% | In a 250 ml three-necked flask, 50 ml of deionized water, 0.01 mol of p-carboxybenzenesulfonamide, 0.02 mol of potassium hydroxide, and 0.01 mol of potassium carbonate were added and mixed uniformly; after the temperature was returned to room temperature, 0.0005 mol of octadecyl ether was added, and the mixture was stirred and dissolved. ,Dropped into 50ml dissolved 0.01molA toluene solution of 5-iodo-3-oxa-octafluoropentylsulfonyl fluoride monomer was reacted at 1000 rpm for 0.5 hmin. The reaction product was separated into an aqueous phase, the pH was adjusted to 4 with 5% hydrochloric acid, and ethyl acetate was evaporated.The yield is about 86%. The nuclear magnetic fluorine spectrum of this final product is shown in Fig. 1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
84.1% | General procedure: To a solution of N,N-dimethylformamide (DMF, 5 mL), 4-carboxy-benzenesul- phonamide (5.0 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCl, 6.0 mmol), and 1-hydroxybenzotriazole (HOBT, 6.0 mmol) were added. The mixture was stirred at room temperature (20-25 C) for 30 min. Then, ethyl 2-aminothiazole-4-carboxylate (6.0 mmol) and 4-dimethylaminopyridine (DMAP, 1.5 mmol) were added to the solution. The reaction was carried out at room temperature (20-25 C) for 24 h. After the reaction was completed, the reaction mixture was extracted with ethyl acetate. The solvent was dried and removed. The obtained solid was purified using column chro- matography (dichloromethane/methanol, 60:1-30:1) to recover compound 2a . The method for synthesizing 2b -2f was the same as that for 2a.Ethyl 2-(4-sulfamoylbenzamido)thiazole-5-carboxylate ( 2a ) . white powder (yield 83.5%), m. p . > 300.0 C; |
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