SbCl5–wet acetonitrile: a new system for chemoselective O-desilylation
摘要:
A new efficient method for deprotection of TBDMS derivatives of phenols, primary alcohols, carboxylic acids and secondary amines, consisting of SbCl5 and MeCN with 0.1% water (w/v), is reported. It effects inter alia desilylation of a CH2OTBDMS group in the presence of a ketal function. (C) 2003 Elsevier Ltd. All rights reserved.
tert-Butyldimethylsilyl Amine (TBDMS-NH2): A Mild and Green Reagent for the Protection of Benzyl Alcohols, Phenols, and Carboxylic Acids under Solvent-Free Conditions
作者:Jeremy A. Duczynski、Rebecca Fuller、Scott G. Stewart
DOI:10.1071/ch16097
日期:——
present the use of the tert-butyldimethylsilyl amine (TBDMS-NH2) as a silylating reagent for phenols, benzylalcohols, and carboxylic acids. Unlike other silyl protection reactions, this reported process with TBDMS-NH2 does not involve the formation of HCl. Importantly, we report the efficacy of this reagent in operating undersolvent-freeconditions and enabling short reaction times.
Methylenations of heteroatom-substituted carbonyls with dimethyl titanocene
作者:Nicos A. Petasis、Shao-Po Lu
DOI:10.1016/0040-4039(95)00320-c
日期:1995.4
Reaction of dimethyl titanocene with a variety of heteroatom-substituted carbonylcompounds, including: silylesters, anhydrides, carbonates, amides, imides, thioesters, selenoesters and acyl silanes gives the corresponding heteroatom-substituted alkenes.
Two New Catalysts for the Dehydrogenative Coupling Reaction of Carboxylic Acids with Silanes—Convenient Methods for an Atom‐Economical Preparation of Silyl Esters
作者:Guo‐Bin Liu、Hong‐Yun Zhao、Thies Thiemann
DOI:10.1080/00397910701465669
日期:2007.8
Abstract Tris(triphenylphosphine)cuprous chloride [Cu(PPh3)3Cl] has been found to be an efficient catalyst for the dehydrosilylation of carboxylic acids with silanes. In the presence of 4 mol% Cu(PPh3)3Cl, dehydrosilylation reactions in acetonitrile afforded the corresponding silyl esters at 80°C in good yields. It was noted that triphenylphosphine itself also functions as an adequate catalyst for
Triphenylphosphine-Catalyzed Dehydrogenative Coupling Reaction of Carboxylic Acids with Silanes – A Convenient Method for the Preparation of Silyl Esters
作者:Guo-Bin Liu、Hong-Yun Zhao、Thies Thiemann
DOI:10.1002/adsc.200600338
日期:2007.4.2
Triphenylphosphine has been found to be an efficient catalyst for the dehydrosilylation of carboxylic acids with silanes. In the presence of 4 mol % of triphenylphosphine (PPh3), dehydrosilylation reactions in DMF afforded the corresponding silyl esters at 120 °C in good yield.