Pd-Catalyzed Regio- and Stereoselective Addition of Boronic Acids to Silylacetylenes: A Stereodivergent Assembly of β,β-Disubstituted Alkenylsilanes and Alkenyl Halides
Pd-catalyzed addition of boronicacids to silylacetylenes is described, providing β,β-disubstituted (E)- or (Z)-alkenylsilanes in satisfactory yields with excellent regio- and stereoselectivity under mild reaction conditions. It represents the first highly regio- and stereoselective addition of boronicacids to aryl and alkenyl silylacetylenes. Moreover, the sequential Pd-catalyzed boron addition/N-halosuccinimide-mediated
A facile stereoselective synthesis of (E)-α-silylvinylstannanes via hydromagnesiation of alkynylsilanes
作者:Mingzhong Cai、Wenyan Hao、Hong Zhao、Jun Xia
DOI:10.1016/j.jorganchem.2004.07.063
日期:2004.11
(E)-α-Silylvinylstannanes have been synthesized by the hydromagnesiation reaction of alkynylsilanes, followed by the reaction with trialkylstannyl chlorides. (E)-α-Silylvinylstannanes can undergo the cross-coupling reaction with aryl iodides in the presence of a catalytic amounts of Pd(PPh3)4 and CuI to afford (Z)-1,2-disubstituted vinylsilanes in good yields.
Copper(I)-Catalyzed Transfer of 1-(Trimethylsilyl)-1-alkenyl Group from Boron to Tin: Regio- and Stereoselective Synthesis of (<i>E</i>)-1-(Tributylstannyl)-1-(trimethylsilyl)-1-alkenes
Stereoselective transfer of 1-(trimethylsilyl)-1-alkenyl group from boron to tin has been realized by a catalytic amount of copper(I) iodide in the presence of aqueous NaOH under extremely mild reaction conditions to provide (E)-1-(tributylstannyl)-1-(trimethylsilyl)-1-alkenes (2) exclusively in good to high yields.