methyl 4-(cyanomethyl)benzoate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Part A: To a stirred solution of 7.5 g(153 mmol) sodium cyanide in 75 mL of THF was added 40 mL of DMF followed by 11.5 g(50.2 mmol) of of methyl 4-(bromomethyl)benzoate in 30 mL of DMF over 10 min. The solution was stirred 18 and treated with 100 mL water. The mixture was filtered, rinsed with water, and air-dried briefly to give 6.7 g (76%) of 4-(carbomethoxy)phenylacetonitrile as a white solid. 1H NMR (300 MHz, DMSO) δ 7.95(d, 2H, J=8.4 Hz); 7.47(d, 2H, J=8.5 Hz); 4.14(s, 2H); 3.82(s, 3H). Part B: The above nitrile ester was stirred with 120 mL of 6 N aq. HCl for 18 h at reflux and then cooled. The mixture was diluted with 160 mL water and then filtered. The white solid was rinsed with water, air-dried briefly, and placed in a vacuum oven at 75° C. for 1 h. This affords 6.89 g (100%) of 4-(carboxy)phenylacetic acid. 1H NMR (300 MHz, DMSO) δ 7.92(d, 2H, J=8.5 Hz); 7.49(d, 2H, J=8.4 Hz); 3.63(s, 2H) The mixture was filtered rinsed with water air-dried briefly

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of potassium tert-butoxide (4.81 g) in THF (15 mL) at −30° C. was added a solution of ethyl iodide (4.11 mL) and methyl 4-(cyanomethyl)benzoate (3 g) THF (15 mL) under nitrogen atmosphere over 20 min. The reaction mixture was allowed to warm to room temperature and stirred for 2 h. The reaction was quenched by the addition of water (10 mL) and ethyl acetate was added. The organic layer was washed successively with water, brine and dried over anhydrous sodium sulfate. The organic solvent was removed to obtain a residue, which was purified by column chromatography (silicagel, 20% ethyl acetate in petroleum ether) to obtain a crude solid. The crude solid was crystallized using chloroform in petroleum ether to afford the title compound. The reaction was quenched by the addition of water (10 mL) and ethyl acetate was added The organic layer was washed successively with water, brine dried over anhydrous sodium sulfate The organic solvent was removed to obtain a residue, which was purified by column chromatography (silicagel, 20% ethyl acetate in petroleum ether) to obtain a crude solid The crude solid was crystallized

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In dichloromethane (20 ml), methyl 4-hydroxymethylbenzoate (1.00 g) was dissolved, followed by the addition of triethylamine (0.9 ml). Under ice cooling, a solution of methanesulfonyl chloride (0.70 g) in dichloromethane (dichloromethane: 5 ml) was added to the resulting solution. The resulting mixture was stirred at room temperature for 15 hours. After dilution with dichloromethane, the reaction mixture was washed with water and was then dried over anhydrous sodium sulfate. The residue obtained by distilling off the solvent under reduced pressure was dissolved in acetonitrile (12 ml). To the resulting solution, potassium cyanide (0.80 g) and 18-Crown-6 (0.16 g) were added, followed by stirring at room temperature for 40 hours. After concentration under reduced pressure, the concentrate was diluted with dichloromethane, washed with water and then, dried over anhydrous sodium sulfate. The residue obtained by distilling off the solvent under reduced pressure was purified by chromatography on a silica gel column (dichloromethane), whereby colorless crystals (0.91 g, 86%) was obtained. A portion of the resulting crystals was recrystallized from a mixed solvent of hexane and ethyl acetate, whereby colorless crystals were obtained. After dilution with dichloromethane, the reaction mixture was washed with water was then dried over anhydrous sodium sulfate The residue obtained by distilling off the solvent under reduced pressure was dissolved in acetonitrile (12 ml) To the resulting solution, potassium cyanide (0.80 g) and 18-Crown-6 (0.16 g) were added by stirring at room temperature for 40 hours After concentration under reduced pressure the concentrate was diluted with dichloromethane washed with water dried over anhydrous sodium sulfate The residue obtained by distilling off the solvent under reduced pressure was purified by chromatography on a silica gel column (dichloromethane)

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In dichloromethane (20 ml), methyl 4-hydroxymethylbenzoate (1.00 g) was dissolved, followed by the addition of triethylamine (0.9 ml). Under ice cooling, a solution of methanesulfonyl chloride (0.70 g) in dichloromethane (dichloromethane: 5 ml) was added to the resulting solution. The resulting mixture was stirred at room temperature for 15 hours. After dilution with dichloromethane, the reaction mixture was washed with water and was then dried over anhydrous sodium sulfate. The residue obtained by distilling off the solvent under reduced pressure was dissolved in acetonitrile (12 ml). To the resulting solution, potassium cyanide (0.80 g) and 18-Crown-6 (0.16 g) were added, followed by stirring at room temperature for 40 hours. After concentration under reduced pressure, the concentrate was diluted with dichloromethane, washed with water and then, dried over anhydrous sodium sulfate. The residue obtained by distilling off the solvent under reduced pressure was purified by chromatography on a silica gel column (dichloromethane), whereby colorless crystals (0.91 g, 86%) was obtained. A portion of the resulting crystals was recrystallized from a mixed solvent of hexane and ethyl acetate, whereby colorless crystals were obtained. After dilution with dichloromethane, the reaction mixture was washed with water was then dried over anhydrous sodium sulfate The residue obtained by distilling off the solvent under reduced pressure was dissolved in acetonitrile (12 ml) To the resulting solution, potassium cyanide (0.80 g) and 18-Crown-6 (0.16 g) were added by stirring at room temperature for 40 hours After concentration under reduced pressure the concentrate was diluted with dichloromethane washed with water dried over anhydrous sodium sulfate The residue obtained by distilling off the solvent under reduced pressure was purified by chromatography on a silica gel column (dichloromethane)

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 4-cyanomethyl benzoic acid methyl ester (2.63 g, 15 mmol) in anhydrous toluene (100 mL) was added sodium azide (1.95 g, 30 mmol) and triethylamine hydrochloride (4.13 g, 30 mmol). The reaction mixture was stirred at 100° C. for 24 hours under nitrogen. The reaction mixture was cooled to room temperature, then extracted with water (2×100 mL). The aqueous layer was acidified with concentrated HCl to pH approximately 4. The white solid was filtered off, washed with water, and dried under vacuum at 40° C. overnight, to give methyl-4-(1H-tetrazol-5-ylmethyl)benzoate (2.88 g, 88%) as an off-white solid. The reaction mixture was cooled to room temperature extracted with water (2×100 mL) The white solid was filtered off washed with water dried under vacuum at 40° C. overnight

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 4-cyanomethyl benzoic acid methyl ester (2.63 g, 15 mmol) in anhydrous toluene (100 mL) was added sodium azide (1.95 g, 30 mmol) and triethylamine hydrochloride (4.13 g, 30 mmol). The reaction mixture was stirred at 100° C. for 24 hours under nitrogen. The reaction mixture was cooled to room temperature, then extracted with water (2×100 mL). The aqueous layer was acidified with concentrated HCl to pH approximately 4. The white solid was filtered off, washed with water, and dried under vacuum at 40° C. overnight, to give methyl-4-(1H-tetrazol-5-ylmethyl)benzoate (2.88 g, 88%) as an off-white solid. The reaction mixture was cooled to room temperature extracted with water (2×100 mL) The white solid was filtered off washed with water dried under vacuum at 40° C. overnight