Fast and Convenient Synthesis of α-N-Protected Amino Acid Hydrazides
作者:Giancarlo Verardo、Paola Geatti、Barbara Lesa
DOI:10.1055/s-2004-837300
日期:——
A fast, simple and convenient synthesis of α-N-protected amino acid hydrazides is reported. The procedure involves the reaction between hydrazine monohydrate and the mixed anhydride obtained from an α-N-protected amino acid and ethyl chloroformate. When methylhydrazine was used, the reaction showed a good selectivity, yielding a mixture of 1-acyl-l-methylhydrazine and 1-acyl-2-methylhydrazine in a
The coupling reactions of 3-phenylpropanoic acid and N-carboxybenzyl α-aminoacids with unprotected α-aminoacids containing hydrophilic side chains such as aliphatic alcohol, aromatic alcohol, thiol, carboxylic acid, and amide afforded the corresponding amides in 66–96% yield without racemization via the corresponding mixed carbonic carboxylic anhydrides under basic conditions through an ecological