A concise preparation of the non-proteinogenic amino acid l-kynurenine
摘要:
A concise and practical preparation of the non-proteinogenic amino acid L-kynurenine is reported. The synthetic approach is scalable and provides ready access to this valuable amino acid in either L- or D-stereochemistry starting from L- or D-tryptophan, respectively. In the optimized procedure, two discreet oxidation steps are applied sequentially to convert the tryptophan indole ring into the keto-aniline moiety contained within the kynurenine side chain. (C) 2012 Elsevier Ltd. All rights reserved.