Synthesis of Multisubstituted Olefins through Regio- and Stereoselective Silylborylation of an Alkynylboronate/Chemoselective Cross-Coupling Sequences
作者:Jiao Jiao、Kiyohiko Nakajima、Yasushi Nishihara
DOI:10.1021/ol401333j
日期:2013.7.5
A highly regio- and stereoselective silylborylation of an alkynylboronate is disclosed. PhMe2Si-B-pin undergoes a Pd(OAc)(2)/(t)OctNC-catalyzed syn-addition to the alkynylboronate to yield 1-phenyl-1-silyl-2,2-diborylethene with high regioselectivity. The product 1-phenyl-1-silyl-2,2-diborylethene is then chemoselectively arylated by Suzuki-Miyaura coupling to afford (2)-1-silyl-2-borylstilbene derivatives. This approach is extended to the synthesis of a tetraarylated olefin with four different substituents.