and [(Cinnamyl)PdCl]2/BINAP is superior to other Pd salt/ligand framework combinations. Our optimized protocol is compatible with a variety of silanol substrates. Importantly, the cyclization is perfectly stereospecific, proceeding via an anti-syn mechanism, which stands in contrast to reported analogous reactions of alcohols and phenols, known to proceed via an anti-anti mechanism. The alkenes in
我们证明,二叔丁基
硅醇是能够进行分子内拦截
钯 π- 烯丙基物质的亲核试剂。在这些反应中,烯丙基乙基
碳酸酯是形成
钯 π- 烯丙基中间体的最佳前体,并且 [(Cinnamyl)PdCl] 2 /BINAP 优于其他 Pd 盐/
配体框架组合。我们的优化方案与多种
硅醇底物兼容。重要的是,环化是完全立体特异性的,通过反顺机制进行,这与报道的
醇类和
酚类类似反应形成对比,已知通过反-反机制进行机制。产物二恶
硅烷中的烯烃用作进一步功能化的空白石板。