A Facile β-Cyclodextrin-Catalyzed Oxidative Deprotection of <i>tert</i>-Butyldimethylsilyl (TBDMS) Ethers with NBS in Water
作者:K. Rao、M. Reddy、M. Narender、Y. Nageswar
DOI:10.1055/s-2005-861808
日期:——
Treatment of TBDMS ethers with NBS in the presence of β-cyclodextrin in water results, for the first time, in the cleavage of the silicon-oxygen bond, carbonyl compounds are obtained upon oxidation.
A very efficient and mild procedure for preparation of silyl ethersfrom benzylic, allylic, propargilic alcohols, phenols, naphtoles and some of phenolic drugs with trimethylsilylchloride (TMSCl), triethylsilylchloride (TESCl) and t‐buthyldimethylsilyl chloride (TDSCl) ethers in the presence of Fe(HSO4)3/Et3N in room temperature in excellent yields is reported. This procedure also allows the excellent
在存在下,由苄基,烯丙基,丙二醇,苯酚,萘酚和某些酚类药物与三甲基氯硅烷(TMSCl),三乙基氯硅烷(TESCl)和叔丁基二甲基甲硅烷基氯(TDSCl)醚一起制备甲硅烷基醚的非常有效且温和的方法据报道,在室温下Fe(HSO 4)3 / Et 3 N具有极好的收率。该方法还使醇和酚的甲硅烷基化具有极好的选择性。
NEW APPLICATIONS OF SOLID SILICA CHLORIDE (─SiO<sub>2</sub>Cl): EFFICIENT OXIDATION OF CYCLIC THIOACETALS, TMS, TBDMS, AND THP ETHERS TO THEIR CARBONYL COMPOUNDS BY SOLID SILICA CHLORIDE/KMnO<sub>4</sub> SYSTEM
aromatic and aliphatic cyclic thioacetals (1,3-dithiolanes, 1,3-dithianes) and silyl and pyranyl ethers into their corresponding carbonylcompounds in dry CH3CN at room temperature in high yields. Over-oxidation of aldehydes to carboxylic acids has not been observed by this system. In the absence of silica chloride, KMnO4 in dry CH3CN is an ineffective reagent for these oxidations.
IMMEDIATE AND HIGH YIELDING SOLVENT-FREE OXIDATION OF SILYL AND PYRANYL ETHERS TO THEIR CORRESPOUNDING CARBONYL COMPOUNDS WITH ZINC DICHROMATE TRIHYDRATE (ZnCr<sub>2</sub>O<sub>7</sub>·3H<sub>2</sub>O)
Zinc dichromate trihydrate (ZnCr2O7.3H(2)O) is an efficient reagent for the immediate deprotection of aromatic and aliphatic silyl and pyranyl ethers into their corresponding carbonyl compounds in high yields at room temperature under solvent-free conditions.
A New Method for Removing the<i>t</i>-Butyldimethylsilyl Protecting Group
作者:R. J. Batten、A. J. Dixon、R. J. K. Taylor、R. F. Newton