The facile synthesis of a series of tryptophan derivatives
作者:Georg Blaser、John M. Sanderson、Andrei S. Batsanov、Judith A.K. Howard
DOI:10.1016/j.tetlet.2008.02.120
日期:2008.4
of 5- and 6-substituted tryptophan derivatives that are difficult to prepare using alternative enzymatic approaches. Acylation of an activated amino acid, derived from serine in situ, is coupled with an enzymatic resolution step to furnish enantiopure analogues bearing a range of electron withdrawing and releasing substituents. Isolation of a dehydroalanine derivative as a by-product from some reactions
Compounds 7' and 61-bromo-D-tryptophan (1 and 2) which are important derivatives for the synthesis of the chloropeptin and kistamycin A, respectively, were conveniently synthesized by optical resolution from N-acetyl-7' and 6-bromo-DL-tryptophan ((RS)-5 and (RS)-14) using D-aminoacylase. (C) 2002 Elsevier Science Ltd. All rights reserved.