Synthesis of Alkynylmethylidene‐benzoxasiloles through a Rhodium‐Catalyzed Cycloisomerization Involving 1,2‐Silicon and 1,3‐Carbon Migration
作者:Tomoya Namba、Susumu Kawauchi、Yu Shibata、Hiroshi Kanno、Ken Tanaka
DOI:10.1002/anie.201612560
日期:2017.3.6
2‐(alkynylsilylethynyl)phenols, leading to alkynylmethylidene‐benzoxasiloles through concomitant silicon and carbon migration. This unprecedented cycloisomerization presumably proceeds via the formation of rhodium vinylidenes through 1,2‐silicon migration, followed by 1,3‐carbon (alkyne) migration via the formation of hypervalent silicon centers.
结果表明,阳离子铑(I)/二苯醚配合物催化2-(炔基甲硅烷基乙炔基)酚的环异构化,通过伴随的硅和碳迁移导致炔基亚甲基-苯并二甲酚。这种空前的环异构化大概是通过1,2-硅迁移形成亚乙烯基铑,然后通过高价硅中心形成1,3-碳(炔)迁移而进行的。