A new and efficient method for the synthesis of bromosilanes from hydrosilanes using Br3CCOOEt/PdCl2 as the catalyst
摘要:
Bromosilanes were prepared conveniently and efficiently via the reaction of hydrosilanes and Br3CCOOEt in the presence of a catalytic amount of PdCl2 in refluxing THE over 15 min in high yields. The developed methodology was further applied for the one-pot synthesis of silyl ethers and silyl esters in excellent yields. (C) 2011 Elsevier Ltd. All rights reserved.
The chemoselective and efficient deprotection of silyl ethers using trimethylsilyl bromide
作者:Syed Tasadaque A. Shah、Patrick J. Guiry
DOI:10.1039/b803949f
日期:——
An efficient and chemoselective cleavage of silyl ethers (primary, secondary and aromatic) by using catalytic quantities of trimethylsilylbromide (TMSBr) in methanol is reported. A wide range of alkyl silyl ethers such as TBS, TIPS, and TBDPS can be chemoselectively cleaved in high yield in the presence of aryl silyl ethers. The deprotection of silyl esters was also achieved employing catalytic quantities
A very simple and efficient method is described for silylation of alcohols and phenols using triisopropylsilyl chloride and imidazole under microwave irradiation. High selectivity was observed for silylation of primary and secondary alcohols and also for structurally different phenols.
A mild and chemoselective method for the deprotection of tert-butyldimethylsilyl (TBDMS) ethers using iron(III) tosylate as a catalyst
作者:Jason M. Bothwell、Veronica V. Angeles、James P. Carolan、Margaret E. Olson、Ram S. Mohan
DOI:10.1016/j.tetlet.2009.12.076
日期:2010.2
TBDMS ethers utilizes stoichiometric amounts of tetrabutylammonium fluoride, n-Bu4N+F− (TBAF), which is highly corrosive and toxic. We have developed a mild and chemoselective method for the deprotection of TBDMS, TES, and TIPS ethers using iron(III) tosylate as a catalyst. Phenolic TBDMS ethers, TBDPS ethers and the BOC group are not affected under these conditions. Iron(III) tosylate is an inexpensive
EFFECTIVE SILYLATION OF CARBOXYLIC ACIDS UNDER SOLVENT-FREE CONDITIONS WITH <i>tert</i>-BUTYLDIMETHYLSILYL CHLORIDE (TBDMSCL) AND TRIISOPROPYLSILYL CHLORIDE (TIPSCL)
Various types of carboxylic acids can be converted effectively to their corresponding TBDMS and TIPS esters using TBDMSCI and TIPSCI in the presence of imidazole under solvent-free conditions. The advantage of this modified method in comparison with that reported by Corey is the elimination of DMF, which eliminates aqueous work-up. The method is not a time-consuming process and the reactions proceed spontaneously. By this method, absolute chemoselectivity for the protection of carboxylic acid functions in the presence of 2 degrees, 3 degrees hydroxyl groups are observed.