Depsipeptides have been prepared in a stepwise fashion by a method using the dichloroacetyl (Dca) group as a suitable protecting group for the hydroxy group of hydroxy acids and 2-nitrophenylsulphenyl (Nps)N-carboxy α-amino acid anhydrides (NCAs) as a highly reactive amino acid derivative to acylate the hydroxy compounds.
R. Katakai, J. Chem. Soc., Chem. Commun., 1988, 1229 DOI: 10.1039/C39880001229
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