Cascade radical cyclisations leading to polycyclic diterpenes. Total synthesis of (±)-spongian-16-one
作者:Gerald Pattenden、Lee Roberts、Alexander J. Blake
DOI:10.1039/a708042e
日期:——
A cascade of three consecutive 6-endo-trig radical cyclisations from the polyene acyl radical intermediate 12 derived from the selenoate 11 is used to construct the trans,anti,trans,anti,cis-tetracyclic keto lactone 20 in one step. Manipulation of the ketone function in 20 to the corresponding gem-dimethyl substituted carbon then completed a concise synthesis of the marine metabolite spongian-16-one 1.
硒酸盐 11 衍生出的多烯酰基中间体 12 通过三个连续的 6-内向-三自由基环化级联反应,一步构建出反式、反式、反式、顺式四环酮内酯 20。然后,将 20 中的酮官能团操纵到相应的 gem-dimethyl 取代碳上,就完成了海洋代谢物 spongian-16-one 1 的简易合成。