Highly Regioselective Hydrosilylation of Unsymmetric Alkynes Using a Phenylthio Directing Group
作者:Kuan-Hsun Huang、Minoru Isobe
DOI:10.1002/ejoc.201402577
日期:2014.8
Cobalt-assisted hydrosilylation of acetylenes is particularly interesting in organic synthesis since alkynyl group functionalization can give way to more useful substructures. This study aims to answer the general question of how to control hydrosilylationregioselectivity with unsymmetric alkynyl groups. Cobalt-catalyzed hydrosilylation is highlyregioselective with alkyl-phenylthio-acetylenes affording
thioalkynes with exclusive stereoselectivity facilitated by an organic base, which could proceed exceedingly fast under ambient atmosphere and room temperature, affording β trans addition products in up to nearly quantitative yields. The dual nature of the sulfur atom in attracting and donating electrons is supposed to be pivotal in determining the regio- and stereoselectivity. This system tolerates a
Short and efficient preparation of alkynyl selenides, sulfides and tellurides from terminal alkynes
作者:Lothar W Bieber、Margarete F da Silva、Paulo H Menezes
DOI:10.1016/j.tetlet.2004.02.042
日期:2004.3
Diphenyl diselenide reacts with terminal alkynes at room temperature in DMSO in the presence of catalytic amounts of copper iodide to give good to excellent yields of alkynyl phenyl selenides. The reaction occurs under neutral conditions and the solvent acts as the oxidant. Diphenyl disulfide and ditelluride undergo the analogous reaction, but require the presence of a weak inorganic base. (C) 2004 Published by Elsevier Ltd.
A highly selective synthesis of versatile (E)-1-phenylthio vinylstannanes
作者:Plato A. Magriotis、John T. Brown、Mary E. Scott
DOI:10.1016/s0040-4039(00)93424-5
日期:1991.9
An efficient, palladium-catalyzed hydrostannation of 1-phenylthio-1-alkynes 1 is described. This novel tributyltin hydride addition provides versatile 1-phenylthio vinylstannanes 2 regio- and stereoselectively.
MAGRIOTIS, PLATO A.;DOYLE, TIMOTHY J.;KIM, KEE D., TETRAHEDRON LETT., 31,(1990) N8, C. 2541-2544
作者:MAGRIOTIS, PLATO A.、DOYLE, TIMOTHY J.、KIM, KEE D.