Sulfoxides in the allylation of aldehydes in the presence of silicon tetrachloride and allyltributylstannane
作者:Antonio Massa、Laura Capozzolo、Arrigo Scettri
DOI:10.2478/s11532-010-0099-7
日期:2010.12.1
SiCl4 can be conveniently activated by catalytic amounts of dimethylsulfoxide or other readily-available sulfoxides for the allylation of aromatic, hetero-aromatic and unsaturated aldehydes in the presence of allyltributyl stannane. Chiral aryl methyl sulfoxides have been used to develop asymmetric allylation methods, as well as probe the aldehyde substrate scope.
A catalytic asymmetric allylation of aldehydes with allyl trichlorosilane activated by a chiral tetradentate bis-sulfoxide
作者:Antonio Massa、Maria Rosaria Acocella、Vincenzo De Sio、Rosaria Villano、Arrigo Scettri
DOI:10.1016/j.tetasy.2009.01.023
日期:2009.2
Chiral homoallylicalcohols are easily accessible by asymmetric allylation of aldehydes with allyl trichlorosilane in the presence of catalytic amounts of a chiral tetradentate bis-sulfoxide, as organocatalyst, whose synthesis is reported.
A new convenient method for the asymmetric transfer allylation of aromatic aldehydes was developed. The reaction gave the best results using a chiral allyl donor molecule derived from (–)-menthone in the presence of heteropoly acids supported on silica gel undersolvent-freeconditions, and the desired homoallylic alcohol derivatives were obtained in good yields with good to high enantioselectivity
New chiral imino- and amino-sulfoxides as activators of allyl trichlorosilane in the asymmetric allylation of aldehydes
作者:Vincenzo De Sio、Maria Rosaria Acocella、Rosaria Villano、Arrigo Scettri
DOI:10.1016/j.tetasy.2010.04.015
日期:2010.6
Chiral 2-methylsulfinyl benzaldehyde proved to be a valuable starting material for a convenient approach towards a variety of imino- and amino-sulfoxides. The catalytic properties of these new ligands, as potential activators of allyl trichlorosilane, have been exploited in new catalytic procedures for the synthesis of enantioenriched homoallylic alcohols. (C) 2010 Elsevier Ltd. All rights reserved.
Chiral sulfoxides as activators of allyl trichlorosilanes in the stereoselective allylation of aldehydes
作者:Vincenzo De Sio、Antonio Massa、Arrigo Scettri
DOI:10.1039/c002988b
日期:——
Chiral aryl methyl sulfoxides proved to be efficient activators in the asymmetric allylation of aldehydes with allyl trichlorosilanes. High enantioselectivity was found in the case of electron-poor aldehydes. The high levels of diastereoselectivity and the detection of nonlinear effects have allowed the elucidation of some mechanistic aspects of the reaction.