[reaction: see text] A gold(I) complex of Xantphos AuCl(xantphos) catalyzes the dehydrogenativesilylation of alcohols with high chemoselectivity and solvent tolerance. It is selective for the silylation of hydroxyl groups in the presence of alkenes, alkynes, alkyl halides (RCl, RBr), ketones, aldehydes, conjugated enones, esters, and carbamates.
Versatile Dehydrogenative Alcohol Silylation Catalyzed by Cu(I)−Phosphine Complex
作者:Hajime Ito、Akiko Watanabe、Masaya Sawamura
DOI:10.1021/ol050559+
日期:2005.4.1
[reaction: see text] Cu(I) complexes of xanthane-based diphosphines were versatile catalysts for dehydrogenative alcohol silylation, exhibiting high activity and broad substrate scope. Highlyselectivesilylation of 1-decanol over 2-decanol is possible even with a silylating reagent of small steric demand such as HSiMe(2)Ph or HSiEt(3).
An atom-efficient and powerful method for direct esterification of silyl ethers catalyzed by HClO4–SiO2
作者:Ti-Jian Du、Qin-Pei Wu、Hai-Xia Liu、Xi Chen、Yi-Nan Shu、Xiao-Dong Xi、Qing-Shan Zhang、Yun-Zheng Li
DOI:10.1016/j.tet.2010.12.028
日期:2011.2
An efficient and convenient procedure for direct esterification of alkyl and aryl silyl ethers with Ac2O and a catalyst system of perchloric acid immobilized on a silica gel (HClO4 SiO2) has been developed. The silyl protecting groups are directly replaced by acetyls and the protecting groups themselves are transformed into acetates as the sole byproducts, which can be readily recovered and converted back to silylchlorides, the original protecting agents, thus minimizing wastes. (C) 2010 Elsevier Ltd. All rights reserved.
A one-step and chemoselective conversion of silyl-protected alcohols into the corresponding acetates
作者:Takeshi Oriyama、Mihoko Oda、Junko Gono、Gen Koga
DOI:10.1016/s0040-4039(00)73040-1
日期:1994.3
A reagent system of acetyl bromide combined with a catalytic amount of tin(II) bromide cleaves readily trialkylsilyl ethers to give the corresponding acetates in high yields under very mild conditions.