Asymmetric synthesis of unusual amino acids: Synthesis of optically pure isomers of N-indole- (2-mesitylenesulfonyl)-β-methyltryptophan
作者:Lakmal W. Boteju、Kirsten Wegner、Xinhua Qian、Victor J. Hruby
DOI:10.1016/s0040-4020(01)86957-x
日期:1994.2
We have developed methods for the synthesis of the four optically pure isomers of β-methyltryptophan with the 2-mesitylenesulfonyl indole protecting group for peptide synthesis. Starting from 3-indoleacrylic acid, the β-methyl function was generated by a chiral auxiliary-directed asymmetric conjugate 1,4-addition. Asymmetric bromination was achieved via a tandem addition of N-bromosuccinimide to the