Asymmetric Synthetic Access to the Hetisine Alkaloids: Total Synthesis of (+)-Nominine
作者:Kevin M. Peese、David Y. Gin
DOI:10.1002/chem.200701290
日期:2008.2.8
A dual cycloaddition strategy for the synthesis of the hetisine alkaloids has been developed, illustrated by a concise asymmetric total synthesis of (+)-nominine (7). The approach relies on an early-stage intramolecular 1,3-dipolar cycloaddition of a 4-oxido-isoquinolinium betaine dipole with an ene-nitrile dipolarophile. Subsequent late-stage pyrrolidine-induced dienamine isomerization/Diels-Alder
已经开发了一种用于合成 hetisine 生物碱的双环加成策略,通过 (+)-nominine (7) 的简洁不对称全合成来说明。该方法依赖于 4-氧化异喹啉甜菜碱偶极子与烯腈偶极体的早期分子内 1,3-偶极环加成反应。随后后期吡咯烷诱导的二烯胺异构化/Diels-Alder 级联允许在此类 C(20)-二萜生物碱中快速构建碳-氮多环骨架。