Cross-dimerization of various terminal alkynes with different bulky terminal alkynes such as triisopropylsilylacetylene and 1-trimethylsilyloxy-1,1-diphenyl-2-propyne efficiently proceeds in the presence of a rhodium catalyst system to produce the corresponding (E)-enynes with high regio- and stereoselectivity.
Useful synthetic reagents derived from 1-triisopropylsilylpropyne and 1,3-[triisopropylsilyl]propyne, direct, stereoselective synthesis of either or enynes
作者:E.J. Corey、Christopher Rücker
DOI:10.1016/s0040-4039(00)86930-0
日期:1982.1
(Z)-Selective Wittig and Corey–Chaykovsky reactions of propargyl ylides using trialkylgallium bases
Trialkylgalliums deprotonated propargylphosphonium salts and propargylsulfonium salts to form propargyl ylides. The resulted organogallium intermediates underwent the Wittig reaction and the Corey-Chaykovsky reaction with aldehydes giving (Z)-enynes and (Z)-epoxides predominantly. The use of an appropriate trialkylgallium is essential for the stereoselectivity. (c) 2008 Elsevier Ltd. All rights reserved.
COREY, E. J.;RUECKER, C., TETRAHEDRON LETT., 1982, 23, N 7, 719-722