作者:Timothy J. Donohoe、Rhian E. Thomas、Matthew D. Cheeseman、Caroline L. Rigby、Gurdip Bhalay、Ian D. Linney
DOI:10.1021/ol801415d
日期:2008.8.21
A general strategy for the production of pyrrolizidine alkaloids is described, starting from intermediate (+)-9. The key features are diastereoselective dihydroxylation, inversion at the ring junction by hydroboration of an enamine, and ring closure to form the bicyclo ring system. This route is attractive because of its brevity and versatility; four natural products were prepared with differing stereochemistry
从中间体(+)-9开始,描述了制备吡咯烷核生物碱的一般策略。主要特征是非对映选择性二羟基化,烯胺的氢硼化在环结处发生转化以及闭环形成双环系统。该路线之所以具有吸引力,是因为它的简洁性和多功能性。制备了四种具有不同立体化学和取代模式的天然产物。最后,这项工作允许分配2,3,7-triepiaustraline和hyacinthacine A 7的绝对立体化学。