Synthesis of Anisolylated Aspartyl and Glutamyl Tripeptides
摘要:
A process has been developed for transforming the beta-carboxyl of aspartate and the gamma-carboxyl of glutamate into anisolyl ketones. These ketones are occasional byproducts in peptide synthesis, resulting from deprotection or resin-removal processes in the presence of anisole as a scavenger. The ketone amino acids have been incorporated in a tripeptide by coupling with CBMIT. During peptide bond formation-the keto group of the glutamyl residue required protection, which was provided as the ethylene dithioketal.
Enantioselective synthesis of aroylalanine derivatives
作者:Barry Lygo、Benjamin I. Andrews
DOI:10.1016/s0040-4039(03)01017-7
日期:2003.6
paper we report the development of a highly enantioselective method for the synthesis of aroylalanines. The approach described employs a protected 2-amino-4-bromopent-4-enoic acid, generated via the asymmetric phase-transfer catalyzed alkylation of a glycine imine, as a keyintermediate. Suzuki coupling with an aryl boronic acid followed by ozonolysis of the resulting styrene provides efficient access