Triethylamine → N-4-cyanobenzoyl-beta-m-chlorophenyl-alpha,alpha-dimethyl-beta-alanyl-4-piperidineacetic acid methyl ester

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Reaction Steps

N-4-Cyanobenzoyl-β-m-chlorophenyl-α,α-dimethyl-β-alanine (300 mg, 0.84 mmol) was dissolved in methylene chloride (30 ml). To the resulting solution, BOP reagent (409 mg, 0.92 mmol) and triethylamine (1 ml) were added under cooling with ice and the mixture was stirred for 30 minutes. To the reaction mixture was added 4-piperidineacetic acid methyl ester (572 mg, 3.36 mmol) and the resulting mixture was stirred overnight. After the solvent was distilled off, the residue was applied to a silica gel column (2.2×20 cm) and eluted with a mixed solution (hexane:ethyl acetate=3:1). The desired fractions were collected and the solvents were distilled off to yield an oil of N-4-cyanobenzoyl-β-m-chlorophenyl-α,α-dimethyl-β-alanyl-4-piperidineacetic acid methyl ester (270 mg, 65.0%).

Provenance & Evidence