Synthesis of Carbobicyclic Compounds via Palladium−Catalyzed Cyclization/Hydrosilylation: Evidence for Reversible Silylpalladation
作者:Xiang Wang、Harinath Chakrapani、Carmine N. Stengone、Ross A. Widenhoefer
DOI:10.1021/jo001438k
日期:2001.3.1
Cyclization/hydrosilylation of substituted 1-vinyl-1-(3-butenyl)cycloalkanes catalyzed by a 1:1 mixture of (phen)Pd(Me)Cl (1) and NaBAr(4) [phen = 1,10-phenanthroline; Ar = 3,5-C(6)H(3)(CF(3))(2)] formed silylated spirocycles in high yield with excellent regio and diastereoselectivity. Cyclization/hydrosilylation of substituted 3-(3-butenyl)cycloalkenes or 2,3-diallyl-5,6-dimethyl-1,4-hydroquinone
(phen)Pd(Me)Cl(1)和NaBAr(4)1:1混合物催化的取代的1-乙烯基-1-(3-丁烯基)环烷烃的环化/氢化硅烷化[phen = 1,10-phenothroline; Ar = 3,5-C(6)H(3)(CF(3))(2)]高产率形成甲硅烷基化螺环,具有出色的区域选择性和非对映选择性。取代的3-(3-丁烯基)环烯烃或2,3-二烯丙基-5,6-二甲基-1,4-氢醌二乙酸酯(16)的环化/氢化硅烷化形成甲硅烷基化的稠合双环络合物,收率很高。1 / NaBAr(4)催化的硅烷取代1,6,11-壬烯与硅烷的反应导致氢化硅烷化的级联环化。后一步骤用于合成甲硅烷基化的双环戊烷和线性三喹烷。