Preparation of the tricyclic ketopyrrole core of roseophilin by radical macrocyclisation and Paal–Knorr condensation
作者:Jeremy Robertson、Richard J. D. Hatley、David J. Watkin
DOI:10.1039/b005351l
日期:——
A concise synthesis of the tricyclic ketopyrrole segment of roseophilin is described in which key features include stereoselective conjugate addition to monosubstituted cyclopentenones, optimised conditions for the rearrangement of 1°-propargylic alcohols to vinyl ketones, 13-endo-trig free-radical macrocyclisation, and PaalâKnorr pyrrole condensation accompanied by oxidation in situ to complete the synthesis. Model studies on methylene oxidation α- to pyrrole rings are also described.
文中详细介绍了一种关于玫瑰红菌素三环酮吡咯片段的简明合成方法,其关键特征包括对单取代环戊烯酮的选择性立体协同加成反应,优化一级炔丙醇重排为乙烯基酮的条件,13-内向自由基大环化反应,以及伴随着原位氧化完成的Paal-Knorr吡咯缩合反应。同时也描述了α-吡咯环亚甲基氧化的模型研究。