Several Hiyama cross-coupling reactions of oxasilacycloalkenes and aryl iodides are described that produce trisubstituted Z-styrenes in moderate to excellent yields. Both electron-rich and electron-poor aryl iodides are tolerated in the cross-coupling reaction. The oxasilacycloalkene coupling partners were prepared by ruthenium-catalyzed intramolecular anti-hydrosilylation of alkynols. One of the cross-coupling products was converted to a 1-benzoxocane, albeit in low yield, using an intramolecular Buchwald–Hartwig etherification. The cyclic ether produced contains the carbon skeleton of heliannuol A.
描述了几种氧硅环烯烃和芳基碘在Hiyama交叉偶联反应中的反应,产生了产率在中等到优良之间的三取代Z-苯乙烯。在交叉偶联反应中,既可容忍富电子又可容忍贫电子的芳基碘。氧硅环烯烃偶联配体是通过钌催化的炔醇分子内抗氢硅化反应制备的。其中一个偶联产物通过分子内Buchwald–Hartwig醚化反应转化为1-苯并噁咯烷,尽管产率较低。所产生的环状醚含有heliannuol A的碳骨架。