The first total synthesis of toddaquinoline, an alkaloid from Toddalia asiatica
作者:David C Harrowven、Michael I.T Nunn、Nigel J Blumire、David R Fenwick
DOI:10.1016/s0040-4020(01)00336-2
日期:2001.5
cobalt(I) mediated radial cyclisation to a pyridine. Cobalt appears to play a dual role in the reaction, firstly initialising homolysis of the carbon to halogen bond then acting as a Lewis acid to promote cyclisation to C-6. Other approaches examined are also outlined. These include a photocyclisation of an azastilbene; a cyclisation induced by halogen to metal exchange and a tin mediatedradical cyclisation