SN2 reaction of 2-substituted 3-piperidinol mesylate with retention of configuration: application to the asymmetric synthesis of (2R,3S)-CP-99,994
作者:Liang-Xian Liu、Pei-Qiang Huang
DOI:10.1016/j.tetasy.2006.12.009
日期:2006.12
Starting from protected (S)-3-hydroxyglutarimide 2a, the asymmetric synthesis of (2R,3S)-CP-99,994 8 was achieved. The crucial steps were a neighboring group participation leading to pyrrolidino-aziridinium intermediate 25 and the subsequent regioselective ring-opening reaction. In the case where neighboring group participation was not involved, only the eliminated product 15 was obtained.
从受保护的(S)-3-羟基戊二酰亚胺2a开始,实现了(2 R,3 S)-CP-99,994 8的不对称合成。关键步骤是导致邻吡咯烷基-叠氮鎓中间体25和随后的区域选择性开环反应的邻近基团参与。在不涉及邻组参与的情况下,仅获得淘汰产品15。