通过模仿采用模块化组装和发散环化的通用生物合成策略,我们开发了一个四步合成过程,以产生一系列受天然产物启发的支架。通过 Ugi 缩合、N-乙酰乙酰化和重氮转移,将构建块模块化组装到基于哌啶的歧管 6 上,具有羧酸基团,从而产生环化前体。The rhodium-catalyzed tandem cyclization and divergent cycloaddition gave rise to tetracyclic and hexacyclic scaffolds by the appropriate choice of dipolarophiles installed at modules 3 and 4. A different piperidine-based manifold 15 bearing an amino group was successfully applied to
Divergent and Expeditious Access to Fused Skeletons Inspired by Indole Alkaloids and Transtaganolides
摘要:
We report the development of a divergent synthetic process entailing four-step access to the elaborate fused skeletons reminiscent of aspidophytines and transtaganolides. A variety of branched precursors were synthesized on the basis of Ugl condensations and installation of diazoimide and subjected to rhodium-catalyzed tandem reactions. Switching of cyclization modes was demonstrated by the choice of the amine building blocks installed at site C.