Reaction of Allylsilanes and Allylstannanes with Alkynes Catalyzed by Electrophilic Late Transition Metal Chlorides
作者:Carolina Fernández-Rivas、María Méndez、Cristina Nieto-Oberhuber、Antonio M. Echavarren
DOI:10.1021/jo025812n
日期:2002.7.1
The intramolecular reaction of allylsilanes and allylstannanes with alkynes proceeds catalytically in the presence of Pt(II), Pd(II), Ru(II), and Au(III) chlorides. Although more limited, AgOTf also catalyzes the cyclization. Usually, PtCl2 as the catalyst in methanol or acetone gives the best results. The reaction proceeds by exo attack of the allyl nucleophile on the alkyne to form five- or six-membered
在Pt(II),Pd(II),Ru(II)和Au(III)氯化物的存在下,烯丙基硅烷和烯丙基锡与炔烃的分子内反应催化进行。尽管更受限制,但AgOTf也催化环化。通常,PtCl2作为甲醇或丙酮中的催化剂可获得最佳效果。该反应通过烯丙基亲核试剂在炔烃上的外切攻击进行,形成五元或六元环碳环。反应通常以反立体选择性进行。但是,末端取代的三甲基甲硅烷基衍生物通过同型加成反应。中间烯基钯配合物已被烯丙基氯捕获,形成具有额外碳-碳键的烯丙基化衍生物。