A simple and efficient method for selective deprotection of t-butyldimethylsilyl ethers by zinc tetrafluoroborate in water
作者:Brindaban C. Ranu、Umasish Jana、Adinath Majee
DOI:10.1016/s0040-4039(99)00097-0
日期:1999.3
Selective deprotection of t-butyldimethylsilyl ethers has been achieved under mild conditions using an aqueous solution of zinc tetrafluoroborate. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
A Mild, Efficient, Inexpensive, and Selective Cleavage of Primary <i>tert</i>-Butyldimethylsilyl Ethers by Oxone in Aqueous Methanol
作者:Gowravaram Sabitha、Mandali Syamala、J. S.Yadav
DOI:10.1021/ol990140h
日期:1999.12.1
[GRAPHICS]The use of a 50% aqueous methonolic solution of Oxone is described for the selective cleavage of primary tert-butyldimethylsilyl and aryl ethers at room temperature. This method enables one to deprotect tert-butyldimethylsilyl ethers of primary alcohols in the presence of tert-butyldimethylsilyl ethers of secondary and tertiary alcohols and phenols. The silyl ethers of phenols were deprotected at longer reaction times.
Selective Deprotection of <b> <i>tert</i> </b>-Butyldimethylsilyl Ethers Using Nafion-H®/Sodium Iodide (or Bromodimethylsulfonium Bromide) in Methanol
作者:Shikha Rani、J. Lokesh Babu、Yashwant D. Vankar
DOI:10.1081/scc-120026345
日期:2003.12.1
Catalytic amounts of bromodimethyl sulfonium bromide, or Nafion-H along with NaI (1 equiv.), in methanol cleave a variety of TBDMS ethers readily in high yields. Alkyl TBDMS ethers react more readily and selectively compared to phenolic TBDMS ethers, benzyl, and methyl ethers.
InCl3 immobilized in ionic liquids: a novel and recyclable catalytic system for tetrahydropyranylation and furanylation of alcohols
作者:Jhillu Singh Yadav、Basi. V. Subba Reddy、Dughani Gnaneshwar
DOI:10.1039/b210044b
日期:2003.1.20
A mild and highly efficient method has been developed for the protection of hydroxyl compounds as tetrahydropyranyl and furanyl ethers using a catalytic amount of indium trichloride immobilized in 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid under mild conditions. A wide range of functional and protecting groups such as THP, TBDMS, TBDPS, PMB, MOM ethers, acetonides, olefins and epoxides are compatible with ionic liquids. Monoprotection of diols has also been achieved using this novel procedure.