The intramolecular addition of an aryl radical to a pyridine provides a short entry to toddaquinoline
作者:David C. Harrowven、Michael I.T. Nunn
DOI:10.1016/s0040-4039(98)01187-3
日期:1998.8
The paper describes a synthetic approach to toddaquinoline, an unusual alkaloid from the root bark of FormosanToddaliaasiatica. Key steps are a cis-selective Wittig coupling and a trialkyltin mediated, intramolecular cyclisation of an aryl radical to C-6 of a pyridine.
A total synthesis of toddaquinoline exposes a dual role for cobalt in radical additions to pyridines
作者:David C Harrowven、Michael I.T Nunn、Nigel J Blumire、David R Fenwick
DOI:10.1016/s0040-4039(00)01119-9
日期:2000.8
This paper describes the first total synthesis of toddaquinoline, an alkaloid from the root bark of FormosanToddaliaasiatica. Importantly, the synthesis has exposed a dichotomy in radical reactions mediated by tin and cobalt(I) that involve additions to pyridines. Our observations suggest that cobalt plays a dual role in such reactions: firstly initiating homolysis of the carbon to halogen bond,