A photocatalyticsulfonylcarbocyclization of terminal alkynesusingSEt as a tracelessdirectinggroup is developed, providing a facile access to highly substituted cyclopentenes and indenes from readily available starting materials. It represents a new advance on anti-Baldwin 5-endo-trig radical cyclization of all-carbon systems, which may be valuable for the fast construction of five-membered carbocycles
开发了使用 SEt 作为无痕导向基团的末端炔烃的光催化磺酰基碳环化,提供了从容易获得的起始材料中轻松获得高度取代的环戊烯和茚的方法。它代表了全碳系统的反鲍德温 5-endo-trig 自由基环化的新进展,这可能对快速构建五元碳环很有价值。
Stereoselective Synthesis of (<i>Z</i>)-<i>α</i>-Organothiovinyltosylates and their Application in the Synthesis of Highly Functionalized Vinylic Sulfides
作者:Antonio L. Braga、Daniel J. Emmerich、Claudio C. Silveira、Tales L. C. Martins、Oscar E. D. Rodrigues
DOI:10.1055/s-2001-11406
日期:——
Thioacetylenes 1 afford, upon treatment with p-toluenesulfonic acid in dichloromethane, (O,S)-ketene acetals 2 which can act as useful α-(organothio)vinyl carbocation equivalents, opening a novel route to functionalized vinylic sulfides.