A simple and efficient synthesis of an Asp-Gly dipeptide mimetic
摘要:
Alkylation of N-alpha-Boc protected aspartic acid with allyl bromide in the presence of lithium bis(trimethylsilyl)amide (LHMDS) and hexamethylphosphoramide (HMPA) afforded chiral P-allyl substituted aspartic acid in good yields. After deprotection of the N-alpha-Boc group and reprotection as a trifluoroacetamide, the terminal alkene was oxidized to an aldehyde. The aldehyde was then coupled with L-cysteine through a cascade three-bond formation process to afford aspartic acid-glycine bicyclic dipeptide mimetics. (C) 2004 Elsevier Ltd. All rights reserved.