tert-butyl N-benzylcarbamate

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: The compound N-Boc 2-amino-5-(trifluoromethyl)benzoic acid (S. Takagishi, et al., Synlett 1992, 360) was transformed into its methyl ester as described in procedure (80a). A solution of this ester (125 mg, 0.39 mmol) in DMF (6 mL) was charged with K2CO3 (216 mg, 1.6 mmol) and para-chlorobenzyl bromide (160 mg, 0.78 mmol). After 1.5 h, the solution was diluted with EtOAc and was washed with brine solution followed by 1N HCl solution. The organic layer was then washed with Na2CO3 solution, water, and brine. The organic layer was dried (MgSO4), filtered, and concentrated. Flash chromatography of the resulting residue provided the desired N-Boc benzylamine (69 mg), which was dissolved in THF (0.9 mL). The solution was charged with 1N LiOH (0.3 mL) and MeOH (0.3 mL). After stirring for 18 h, the THF was removed and the solution was made acidic (pH=5) with 1N HCl. This solution was extracted with EtOAc (2×). The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated to give N-Boc 2-(para-chlorobenzyl)amino-5-(trifluoromethyl)benzoic acid. was washed with brine solution The organic layer was then washed with Na2CO3 solution, water, and brine The organic layer was dried (MgSO4) filtered concentrated

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

Procedure: The compound N-Boc 2-amino-5-(trifluoromethyl)benzoic acid (S. Takagishi, et al., Synlett 1992, 360) was transformed into its methyl ester as described in procedure (80a). A solution of this ester (125 mg, 0.39 mmol) in DMF (6 mL) was charged with K2CO3 (216 mg, 1.6 mmol) and para-chlorobenzyl bromide (160 mg, 0.78 mmol). After 1.5 h, the solution was diluted with EtOAc and was washed with brine solution followed by 1N HCl solution. The organic layer was then washed with Na2CO3 solution, water, and brine. The organic layer was dried (MgSO4), filtered, and concentrated. Flash chromatography of the resulting residue provided the desired N-Boc benzylamine (69 mg), which was dissolved in THF (0.9 mL). The solution was charged with 1N LiOH (0.3 mL) and MeOH (0.3 mL). After stirring for 18 h, the THF was removed and the solution was made acidic (pH=5) with 1N HCl. This solution was extracted with EtOAc (2×). The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated to give N-Boc 2-(para-chlorobenzyl)amino-5-(trifluoromethyl)benzoic acid. was washed with brine solution The organic layer was then washed with Na2CO3 solution, water, and brine The organic layer was dried (MgSO4) filtered concentrated

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

Procedure: The compound N-Boc 2-amino-5-(trifluoromethyl)benzoic acid (S. Takagishi, et al., Synlett 1992, 360) was transformed into its methyl ester as described in procedure (80a). A solution of this ester (125 mg, 0.39 mmol) in DMF (6 mL) was charged with K2CO3 (216 mg, 1.6 mmol) and para-chlorobenzyl bromide (160 mg, 0.78 mmol). After 1.5 h, the solution was diluted with EtOAc and was washed with brine solution followed by 1N HCl solution. The organic layer was then washed with Na2CO3 solution, water, and brine. The organic layer was dried (MgSO4), filtered, and concentrated. Flash chromatography of the resulting residue provided the desired N-Boc benzylamine (69 mg), which was dissolved in THF (0.9 mL). The solution was charged with 1N LiOH (0.3 mL) and MeOH (0.3 mL). After stirring for 18 h, the THF was removed and the solution was made acidic (pH=5) with 1N HCl. This solution was extracted with EtOAc (2×). The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated to give N-Boc 2-(para-chlorobenzyl)amino-5-(trifluoromethyl)benzoic acid. was washed with brine solution The organic layer was then washed with Na2CO3 solution, water, and brine The organic layer was dried (MgSO4) filtered concentrated

Conditions: temp:78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.2 g (20.3 mmol) of t-butyl benzylcarbamate, 40 cm3 of anhydrous tetrahydrofuran and 6.5 cm3 (5.0 g, 43 mmol) of tetramethylethylenediamine (TMEDA) are introduced successively into a 250 cm3 single-necked flask placed under argon and equipped with a magnetic stirring system. The solution obtained is cooled to 78° C. and 60 cm3 (60 mmol) of a 1M solution of secondary butyllithium in hexane are then added dropwise. The reaction is left to proceed for 3 hours at this temperature and the mixture is then cooled to -100° C. 3 cm3 (2.5 g, 44.9 mmol) of freshly distilled acrolein are then added and the reaction is left to proceed for 3 to 4 minutes at this temperature and then for 1 hour at -78° C. The resulting reaction mixture is hydrolyzed at -78° C. with 20 cm3 of water and then extracted with 2 times 30 cm3 of ether. The organic phases are combined and then washed twice with 20 cm3 of water and once with 10 cm3 of a saturated aqueous solution of sodium chloride. They are then dried over anhydrous sodium sulphate. After filtration, the solvents are driven off under reduced pressure. The residue obtained (11.6 g) is purified on a column of silica gel using a methylene chloride/ether mixture (95/5 by volume) as the eluent. 2.606 g (9.91 mmol) of 1-phenyl-1-t-butoxycarbonylamino-2-hydroxybut-3-ene are obtained with a yield of 49% in the form of a mixture of the syn and anti diastereoisomers in a ratio of 6/1. equipped with a magnetic stirring system The solution obtained The reaction is left the mixture is then cooled to -100° C the reaction is left to proceed for 3 to 4 minutes at this temperature for 1 hour at -78° C The resulting reaction mixture extracted with 2 times 30 cm3 of ether washed twice with 20 cm3 of water and once with 10 cm3 of a saturated aqueous solution of sodium chloride They are then dried over anhydrous sodium sulphate After filtration The residue obtained (11.6 g) is purified on a column of silica gel using a methylene chloride/ether mixture (95/5 by volume) as the eluent

Conditions: temp:78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.2 g (20.3 mmol) of t-butyl benzylcarbamate, 40 cm3 of anhydrous tetrahydrofuran and 6.5 cm3 (5.0 g, 43 mmol) of tetramethylethylenediamine (TMEDA) are introduced successively into a 250 cm3 single-necked flask placed under argon and equipped with a magnetic stirring system. The solution obtained is cooled to 78° C. and 60 cm3 (60 mmol) of a 1M solution of secondary butyllithium in hexane are then added dropwise. The reaction is left to proceed for 3 hours at this temperature and the mixture is then cooled to -100° C. 3 cm3 (2.5 g, 44.9 mmol) of freshly distilled acrolein are then added and the reaction is left to proceed for 3 to 4 minutes at this temperature and then for 1 hour at -78° C. The resulting reaction mixture is hydrolyzed at -78° C. with 20 cm3 of water and then extracted with 2 times 30 cm3 of ether. The organic phases are combined and then washed twice with 20 cm3 of water and once with 10 cm3 of a saturated aqueous solution of sodium chloride. They are then dried over anhydrous sodium sulphate. After filtration, the solvents are driven off under reduced pressure. The residue obtained (11.6 g) is purified on a column of silica gel using a methylene chloride/ether mixture (95/5 by volume) as the eluent. 2.606 g (9.91 mmol) of 1-phenyl-1-t-butoxycarbonylamino-2-hydroxybut-3-ene are obtained with a yield of 49% in the form of a mixture of the syn and anti diastereoisomers in a ratio of 6/1. equipped with a magnetic stirring system The solution obtained The reaction is left the mixture is then cooled to -100° C the reaction is left to proceed for 3 to 4 minutes at this temperature for 1 hour at -78° C The resulting reaction mixture extracted with 2 times 30 cm3 of ether washed twice with 20 cm3 of water and once with 10 cm3 of a saturated aqueous solution of sodium chloride They are then dried over anhydrous sodium sulphate After filtration The residue obtained (11.6 g) is purified on a column of silica gel using a methylene chloride/ether mixture (95/5 by volume) as the eluent

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

Procedure: The compound N-Boc 2-amino-5-(trifluoromethyl)benzoic acid (S. Takagishi, et al., Synlett 1992, 360) was transformed into its methyl ester as described in procedure (80a). A solution of this ester (125 mg, 0.39 mmol) in DMF (6 mL) was charged with K2CO3 (216 mg, 1.6 mmol) and para-chlorobenzyl bromide (160 mg, 0.78 mmol). After 1.5 h, the solution was diluted with EtOAc and was washed with brine solution followed by 1N HCl solution. The organic layer was then washed with Na2CO3 solution, water, and brine. The organic layer was dried (MgSO4), filtered, and concentrated. Flash chromatography of the resulting residue provided the desired N-Boc benzylamine (69 mg), which was dissolved in THF (0.9 mL). The solution was charged with 1N LiOH (0.3 mL) and MeOH (0.3 mL). After stirring for 18 h, the THF was removed and the solution was made acidic (pH=5) with 1N HCl. This solution was extracted with EtOAc (2×). The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated to give N-Boc 2-(para-chlorobenzyl)amino-5-(trifluoromethyl)benzoic acid. was washed with brine solution The organic layer was then washed with Na2CO3 solution, water, and brine The organic layer was dried (MgSO4) filtered concentrated

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

Procedure: The compound N-Boc 2-amino-5-(trifluoromethyl)benzoic acid (S. Takagishi, et al., Synlett 1992, 360) was transformed into its methyl ester as described in procedure (80a). A solution of this ester (125 mg, 0.39 mmol) in DMF (6 mL) was charged with K2CO3 (216 mg, 1.6 mmol) and para-chlorobenzyl bromide (160 mg, 0.78 mmol). After 1.5 h, the solution was diluted with EtOAc and was washed with brine solution followed by 1N HCl solution. The organic layer was then washed with Na2CO3 solution, water, and brine. The organic layer was dried (MgSO4), filtered, and concentrated. Flash chromatography of the resulting residue provided the desired N-Boc benzylamine (69 mg), which was dissolved in THF (0.9 mL). The solution was charged with 1N LiOH (0.3 mL) and MeOH (0.3 mL). After stirring for 18 h, the THF was removed and the solution was made acidic (pH=5) with 1N HCl. This solution was extracted with EtOAc (2×). The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated to give N-Boc 2-(para-chlorobenzyl)amino-5-(trifluoromethyl)benzoic acid. was washed with brine solution The organic layer was then washed with Na2CO3 solution, water, and brine The organic layer was dried (MgSO4) filtered concentrated

Conditions: temp:78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.2 g (20.3 mmol) of t-butyl benzylcarbamate, 40 cm3 of anhydrous tetrahydrofuran and 6.5 cm3 (5.0 g, 43 mmol) of tetramethylethylenediamine (TMEDA) are introduced successively into a 250 cm3 single-necked flask placed under argon and equipped with a magnetic stirring system. The solution obtained is cooled to 78° C. and 60 cm3 (60 mmol) of a 1M solution of secondary butyllithium in hexane are then added dropwise. The reaction is left to proceed for 3 hours at this temperature and the mixture is then cooled to -100° C. 3 cm3 (2.5 g, 44.9 mmol) of freshly distilled acrolein are then added and the reaction is left to proceed for 3 to 4 minutes at this temperature and then for 1 hour at -78° C. The resulting reaction mixture is hydrolyzed at -78° C. with 20 cm3 of water and then extracted with 2 times 30 cm3 of ether. The organic phases are combined and then washed twice with 20 cm3 of water and once with 10 cm3 of a saturated aqueous solution of sodium chloride. They are then dried over anhydrous sodium sulphate. After filtration, the solvents are driven off under reduced pressure. The residue obtained (11.6 g) is purified on a column of silica gel using a methylene chloride/ether mixture (95/5 by volume) as the eluent. 2.606 g (9.91 mmol) of 1-phenyl-1-t-butoxycarbonylamino-2-hydroxybut-3-ene are obtained with a yield of 49% in the form of a mixture of the syn and anti diastereoisomers in a ratio of 6/1. equipped with a magnetic stirring system The solution obtained The reaction is left the mixture is then cooled to -100° C the reaction is left to proceed for 3 to 4 minutes at this temperature for 1 hour at -78° C The resulting reaction mixture extracted with 2 times 30 cm3 of ether washed twice with 20 cm3 of water and once with 10 cm3 of a saturated aqueous solution of sodium chloride They are then dried over anhydrous sodium sulphate After filtration The residue obtained (11.6 g) is purified on a column of silica gel using a methylene chloride/ether mixture (95/5 by volume) as the eluent

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

Procedure: The compound N-Boc 2-amino-5-(trifluoromethyl)benzoic acid (S. Takagishi, et al., Synlett 1992, 360) was transformed into its methyl ester as described in procedure (80a). A solution of this ester (125 mg, 0.39 mmol) in DMF (6 mL) was charged with K2CO3 (216 mg, 1.6 mmol) and para-chlorobenzyl bromide (160 mg, 0.78 mmol). After 1.5 h, the solution was diluted with EtOAc and was washed with brine solution followed by 1N HCl solution. The organic layer was then washed with Na2CO3 solution, water, and brine. The organic layer was dried (MgSO4), filtered, and concentrated. Flash chromatography of the resulting residue provided the desired N-Boc benzylamine (69 mg), which was dissolved in THF (0.9 mL). The solution was charged with 1N LiOH (0.3 mL) and MeOH (0.3 mL). After stirring for 18 h, the THF was removed and the solution was made acidic (pH=5) with 1N HCl. This solution was extracted with EtOAc (2×). The organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated to give N-Boc 2-(para-chlorobenzyl)amino-5-(trifluoromethyl)benzoic acid. was washed with brine solution The organic layer was then washed with Na2CO3 solution, water, and brine The organic layer was dried (MgSO4) filtered concentrated