A Mild and Efficient Method for Chemoselective Silylation of Alcohols Using Hexamethyldisilazane in the Presence of Silica Chloride
作者:Farhad Shirini、Mohammad Ali Zolfigol、Kamal Mohammadi
DOI:10.1080/10426500307866
日期:2003.7
Reaction of alcohols with hexamethyldisilazane in the presence of silica chloride provides efficiently the corresponding trimethylsilyl ethers. This system discriminates absolutely amines and thiols from alcohols.
Chemoselective trimethylsilylation and tetrahydropyranylation of benzylic and primary and secondary aliphatic alcohols proceed efficiently in the presence of 1,3-dibromo-5,5-dimethylhydantoin (DBH) under mild and completely heterogeneous reaction conditions in excellent yields.
Cross-linked poly(4-vinylpyridine/styrene) copolymer-supported bismuth(III) triflate: an efficient heterogeneous catalyst for silylation of alcohols and phenols with HMDS
作者:Sang-Hyeup Lee、Santosh T. Kadam
DOI:10.1002/aoc.1809
日期:2011.8
Cross‐linked poly(4‐vinylpyridine/styrene) copolymer‐supported bismuth(III) triflate (30P/S‐Bi) effectively activates hexamethyldisilazane (HMDS) for the silylation of alcohols and phenols. By the use of this heterogeneous catalytic system, a wide range of alcohols as well as phenols are converted into their corresponding trimethylsilyl ethers in high yield under mild reaction conditions. The catalyst was reused
Silica Triflate as a New, Efficient, and Reusable Reagent for the Chemoselective Silylation of Alcohols and Phenols and Deprotection of Silyl Ethers
作者:F. Shirini、K. Marjani、H. Taherpour Nahzomi、M. A. Zolfigol
DOI:10.1080/10426500701567046
日期:2007.12.24
Silica triflate was easily prepared via reaction of silica gel and trifluoromethane sulfonyl chloride at room temperature. This compound can be employed as an efficient and reusable reagent for the chemoselective silylation of alcohols and phenols in solution and under solvent-free conditions. This reagent also effectively catalyzed the deprotection of silyl ethers in refluxing methanol.
Silylation and Tetrahydropyranylation of Alcohols Catalyzed by Al(HSO<sub>4</sub>)<sub>3</sub>
作者:Farhad Shirini、Mohammad Ali Zolfigol、Masoumeh Abedini
DOI:10.1246/bcsj.78.1982
日期:2005.11
Trimethylsilylation and tetrahydropyranylation of alcohols are efficiently catalyzed by Al(HSO4)3. All reactions were performed under mild and completely heterogeneous conditions in good-to-high yields.