Stille Reactions Catalytic in Tin: A “Sn−F” Route for Intermolecular and Intramolecular Couplings
作者:William P. Gallagher、Robert E. Maleczka
DOI:10.1021/jo0484169
日期:2005.2.1
hypercoordinate by KF(aq) allows Me3SnH to be recycled during a Pd(0)-catalyzed hydrostannation/Stille cascade. Starting with a variety of alkynes, in situ vinyltin formation is followed by Stille reaction with aryl, styryl, benzyl, or vinyl electrophiles present in the reaction mixture. Both inter- and intramolecular versions of the process are possible with tin loads of approximately 6 mol %. Regeneration
由KF (水溶液)超配位的聚甲基氢硅氧烷(PMHS)使Me 3 SnH在Pd(0)催化的氢化锡锡烷/ Stille级联反应过程中得以回收。从各种炔烃开始,在原位形成乙烯基锡,然后与反应混合物中存在的芳基,苯乙烯基,苄基或乙烯基亲电子试剂进行斯蒂勒反应。该方法的分子间和分子内版本都可能具有约6 mol%的锡负载量。认为有机锡氢化物的再生通过Me 3进行SnF中间体。考虑到有机锡氟化物的聚集性质以及以低于化学计量的量使用这些有机锡的能力,与从反应混合物中去除有机锡废料有关的危害和纯化问题被最小化。