Treatment of the iodo-trienone (8 b) with tri-n-butyltin hydride in the presence of AIBN is shown to produce the taxane ring system (11) by way of a tandem radical macrocyclisation - radical transannulation sequence, i.e. (8 b) → (9) → (11) (cf. Scheme 1).
所述
碘trienone(治疗8b中)与AIBN的存在三正
丁基锡氢化物被示出为产生
紫杉烷环系统(11通过串联式自由基大环化的方式) -基团transannulation序列,即(图8b) →(9)→(11)(请参阅方案1)。