(E)-Vinylsilanes were obtained with high selectivities by [Rh(COD)(2)]BF4/2PPh(3)-catalyzed hydrosilylation of 1-alkynes with triethylsilane. A wide range of 1-alkynes were used. The hydrosilylation of propargylic alcohols with triethylsilane gave (E)-gamma-silyl allylic alcohols 2h-r, a useful source of a chiral alcohol, with high selectivities in excellent yields. The reaction can be carried out without protecting the alcohol functionality. The resulting (E)-gamma-silyl allylic alcohols could be transformed into beta-silyl ketones. The isomerization was also catalyzed by [Rh(COD)(2)]BF4/2PPh(3). Furthermore, the tandem hydrosilylation-isomerization of secondary propargylic alcohols could be carried out in a one-pot procedure.
(E)-
丙二烯二
硅烷通过使用[Rh(COD)(2)]BF4/2PPh(3)协同催化的
水硅化反应获得了高选择性,适用于多种一元
炔烃底物。
丙炔醇的
水硅化反应产生γ-
硅基 allylic 醇2h-R,并提供了一种高效产率的构象选择性高的旋
多糖醇。该反应无需保护醇的功能性即可进行。由此产生的(E)-γ-
硅基 allylic 醇可以通过转化得到β-
硅基酮。此外,该[Rh(COD)(2)]BF4/2PPh(3)催化还可以催化
丙炔醇的同分异构化反应。Furthermore, a one-pot tandem hydrosilylation-isomerization of secondary propargylic alcohols can be achieved using this approach.