Journal
TETRAHEDRON LETTERS
Volume 42, Issue 44, Pages 7717-7719Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(01)01626-4
Keywords
amino acids; tryptophan; asymmetric hydrogenation; Suzuki cross coupling
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An efficient method for the synthesis of novel aromatic Substituted, bulky and hydrophobic tryptophan derivatives has been developed. Asymmetric hydrogenations of alpha -enamide 5 using Burk's DuPHOS-based catalysts generated high enantiomerically pure D- and L-alpha -amino acid derivatives 6, which subsequently underwent Suzuki cross couplings with boronic acid derivatives to afford aromatic substituted tryptophan derivatives 7 and 8 in high yields. The method can allow for the preparation of such amino acids in large-scales for extensive structure-activity studies. (C) 2001 Elsevier Science Ltd. All rights reserved.
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