One‐Pot Three‐Component Syntheses of Indoloquinolizidine Derivatives Using an Organocatalytic Michael Addition and Subsequent Pictet–Spengler Cyclization
作者:Xiaoyu Wu、Xiaoyang Dai、Huihui Fang、Linlin Nie、Jie Chen、Weiguo Cao、Gang Zhao
DOI:10.1002/chem.201101468
日期:2011.9.12
one‐pot three‐component cascade sequence towards highly substituted indoloquinolizidines in moderate to good yields with excellent enantioselectivities was developed (see scheme). The absolute stereochemistry at C2 and C12 b was created by the organocatalyzed conjugate addition of in situ formed indole‐tethered β‐enaminoesters to α,β‐unsaturated aldehydes, and a subsequent acid‐promoted intramolecular
1个锅,2个立体中心,3个组分,4个键:已开发出一种有机催化的单锅三组分级联序列,其以中等到良好的产率向高取代的吲哚并喹喔啉类提供了优异的对映选择性(参见方案)。C2和C12b处的绝对立体化学是通过有机催化的共轭加成反应将原位形成的吲哚连接的β-烯氨基酸酯加成到α,β-不饱和醛上,以及随后的酸促进的分子内Pictet-Spengler环化反应。