esters and arylboronic acids produced α-arylated allylsilanes with E-alkene geometry. The reaction tolerated various functional groups in both the arylboronic acids and the allylic esters and afforded functionalized allylsilanes. The reaction of opticallyactive allylic esters took place with excellent α-to-γ chirality transfer with syn stereochemistry to give chiral allylsilanes.
Regio- and diastereo-selectivity of the insertion of aldehydes into alkyne zirconocene complexes
作者:Martin E. Maier、Thorsten Oost
DOI:10.1016/0022-328x(95)05587-2
日期:1995.12
aldehydes into alkyne-zirconocene complexes provides configurationally pureallyl alcohols in a one-pot procedure. In the case of unsymmetrical alkynes, the regioselectivity of the insertion process is high for terminal alkynes. With trimethylsilyl-substituted alkynes the regioseectivity is low. The insertion of chiral aldehydes into the symmetrical oct-4-yne-zirconocene complex provides the Cram isomer as
Trans-3-silyl allylic alcohols via the brown vinylation
作者:Anil M. Rane、Jaime Vaquer、Juan C. Colberg、John A. Soderquist
DOI:10.1016/0040-4039(94)02422-8
日期:1995.2
The addition of representative aldehydes to trans-vinylborane 1 provided pure trans-3-silylallylicalcohols 2 in excellent yields. The combination of dehydroborylation and insertion leads to the novel dihydroisobenzofuran 7.