The cyclization of N-Boc-alpha-alkylserines to corresponding beta-lactones under Mitsunobu reaction conditions and the ring opening with heterocyclic amines (pyrrolidine, piperidine, morpholine and thiomorpholine) produced N-Boc-alpha-alkyl-beta-(sec-amino)alanines. The removal of the Boc group gives di-hydrochlorides of non-protein amino acids.
N-Boc-α-烷基
丝氨酸在 Mitsunobu 反应条件下环化为相应的β-内酯,并用杂环胺(
吡咯烷、
哌啶、吗啉和
硫代吗啉)开环产生 N-Boc-α-烷基-β-(仲
氨基)丙
氨酸。Boc 基团的去除得到非蛋白质
氨基酸的二盐酸盐。