1,1'-Carbonyldiimidazole → Glycine, N-(3-(2-(4-(acetylamino)-1-oxobutyl)-5-chlorophenyl)-1-oxopropyl)-, ethyl ester

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Reaction Steps

1.75 g (0.006 mol) of 2-(4-acetamidobutyryl)-5-chlorohydrocinnamic acid and 0.95 g (0.006 mol) of 1,1'-carbonyldiimidazole are stirred at room temperature in 15 ml of tetrahydrofuran and 1.0 ml (0.006 mol) of N-ethyldiisopropylamine and 0.82 g (0.006 mol) of ethyl glycinate hydrochloride are then added thereto. After stirring at room temperature for 1 hour, the solution is concentrated, extracted with methylene chloride/water, dried with magnesium sulfate and the solvent is distilled in a vacuum. Chromatography on aluminum oxide with ethyl acetate-ethanol (9:1) and crystallization from methylene chloride/t-butyl methyl ether gives ethyl N-[2-(4-acetamidobutyryl)-5-chlorohydrocinnamoyl]-glycinate as white crystals with melting point 96°.

Provenance & Evidence