作者:Darren J. Dixon、Stephen G. Davies
DOI:10.1039/cc9960001797
日期:——
The first asymmetric synthesis of Moiramide B 1 is achieved using lithium amide 4 and pyrrolidinone auxiliary 5; pyrrolidinone auxiliary 5 is used to create the novel (S)-2-methyl-N-benzyloxysuccinimide 15 which is subsequently acylated with the highly reactive tert-butoxycarbonyl-protected N-carboxanhydride of L-valine (Boc-Val-NCA) under strongly basic conditions, without racemization, while lithium amide 4 is used to synthesize homochiral D-β-phenylalanine tert-butyl ester 8.
使用锂酰胺 4 和吡咯烷酮助剂 5 首次不对称合成了 Moiramide B 1;利用吡咯烷酮助剂 5 生成新型 (S)-2-甲基-N-苄氧基琥珀酰亚胺 15,随后在强碱性条件下与高活性叔丁氧羰基保护的 L-缬氨酸 N-甲酸酐(Boc-Val-NCA)酰化,而不会发生外消旋化,同时利用锂酰胺 4 合成同手性 D-β-苯丙氨酸叔丁酯 8。