Asymmetric synthesis of quinolizidine alkaloids (−)-lasubine I, (−)-lasubine II and (+)-subcosine II
作者:Pierre Chalard、Roland Remuson、Yvonne Gelas-Mialhe、Jean-Claude Gramain
DOI:10.1016/s0957-4166(98)00468-6
日期:1998.12
The enantioselective synthesis of (−)-lasubine I 1 and the first asymmetric synthesis of (−)-lasubine II 2 and (+)-subcosine II 3 is described. The key step is the intramolecular cyclization of N-acyliminium ion 4 which is derived from (S)-aminoester 6.
描述了(-)-lasubine I 1的对映选择性合成和(-)-lasubine II 2和(+)-subcosine II 3的第一不对称合成。关键步骤是衍生自(S)-氨基酯6的N-酰基亚胺离子4的分子内环化。