Dimerization–Carbostannylation of Alkynes Catalyzed by a Palladium–Diimine Complex: Regioselectivity, Stereoselectivity and Mechanism
作者:Hiroto Yoshida、Eiji Shirakawa、Yoshiaki Nakao、Yuki Honda、Tamejiro Hiyama
DOI:10.1246/bcsj.74.637
日期:2001.4
Double insertion of alkynes into the C–Sn bond of an alkynyl-, alkenyl-, allyl- or arylstannane proceeded in the presence of a palladium–diimine complex to afford highly conjugated alkenylstannanes with exclusive syn selectivity. Perfect regioselectivities were observed in the dimerization–carbostannylation of ethyl propiolate with a palladium–1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene complex
在钯-二亚胺络合物的存在下,炔烃双插入炔基-、烯基-、烯丙基-或芳基锡烷的 C-Sn 键,以提供具有专属顺式选择性的高度共轭的烯基锡烷。在丙炔酸乙酯与钯-1,2-双[(2,6-二异丙基苯基)亚氨基]苊络合物的二聚-碳甲烷基化反应中观察到了完美的区域选择性,这使得可以区域选择性和立体选择性合成甲锡烷基取代的粘康酸衍生物。通过交叉偶联或同偶联反应进一步扩展了二聚 - 羰基烷基化产物的 π 共轭。钯环戊二烯被提议作为中间体。