Diisopropylethylamine → N-((1R)-1-(N-[(1R)-2-(N'-acetyl-N-methylhydrazino)-1-benzyl-2-oxoethyl]-N-methylcarbamoyl)-2-(2-naphthyl)ethyl)-N-methylcarbamic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 2(R)-(N-tert-butoxycarbonyl-N-methylamino)-3-(2-naphthyl)propionic acid (0.18 g, 0.53 mmol) in methylene chloride (5 ml) was added 1-hydroxy-7-azabenzotriazole (0.072 g, 0.53 mmol) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.10 g, 0.53 mmol) and the mixture was cooled to 0° C. Then acetic acid N'-methyl-N'-((2R)-2-(methylamino)-3-phenylpropionyl)hydrazide (0.11 g, 0.44 mmol) and diisopropylethylamine (0.098 ml, 0.57 mmol) were added and the mixture was stirred at room temperature overnight. Then methylene chloride (50 ml) was added and the mixture was washed with water (10 ml), saturated sodium bicarbonate (10 ml), brine (10 ml), dried (MgSO4), filtered, concentrated in vacuo and chromatographed on silica gel (40 g) with ethyl acetate to give 0.14 g (57%) of N-((1R)-1-(N-[(1R)-2-(N'-acetyl-N-methylhydrazino)-1-benzyl-2-oxoethyl]-N-methylcarbamoyl)-2-(2-naphthyl)ethyl)-N-methylcarbamic acid tert-butyl ester as a colourless oil.

Provenance & Evidence