Copper-catalyzed α-selective hydrostannylation of alkynes for the synthesis of branched alkenylstannanes
作者:H. Yoshida、A. Shinke、Y. Kawano、K. Takaki
DOI:10.1039/c5cc02720a
日期:——
A universal system for highly α-selective hydrostannylation of terminal alkynes has been developed by use of a distannane or a silylstannane as a stannylating reagent under copper catalysis.
Regio- and stereo-selective synthesis of vinylstannanes. Transition-metal catalyzed stannylmetalation of acetylenes and conversion of enol triflates and vinyl iodides into vinylstannanes
Two new methods for the regio- and stereo-selective synthesis of vinylstannanes are described. (i) The reaction of terminal acetylenes with n-Bu3SnMgMe, n-Bu3SnAlEt2, or (n-Bu3Sn)2Zn in the presence of various transition-metal catalysts provides vinylstannanes in good yields. Whereas copper-catalyzed stannylmagnesation of 4-benzyloxy-1-butyne gives (E)-4-benzyloxy-1-tributylstannyl-1-butene exclusively