Lewis Acid-Catalyzed Deprotection of <i>p</i>-Methoxybenzyl Ether
作者:Abderrahim Bouzide、Gilles Sauvé
DOI:10.1055/s-1997-990
日期:1997.10
The p-methoxybenzyl protecting group was readily removed from alcohols and phenols using catalytic amounts of AlCl3 or SnCl2•2H2O in the presence of EtSH at room temperature. Under these mild conditions other protecting groups such as methyl and benzyl ethers, p-nitrobenzoyl esters, TBDPS ethers and isopropylidene acetal were unchanged.
作者:Hua-Dong Xu、Ke Xu、Qing Zheng、Wei-Jie He、Mei-Hua Shen、Wen-Hao Hu
DOI:10.1016/j.tetlet.2014.10.077
日期:2014.12
An efficient and convenient protocol has been developed for ether bondformation in mild conditions. A mixture of primary/secondary ester and allylic/benzylic halide in tetrahydrofuran was treated with KOtBu at room temperature to give ether in high yield. This step economic method enabled direct alkylation of the acyl group masked O-nucleophiles. Application of this method in carbohydrate synthesis
已经开发出一种有效且方便的方案,用于在温和条件下形成醚键。在室温下用KO t Bu处理伯/仲酯和烯丙基/苄基卤化物在四氢呋喃中的混合物,以高收率得到醚。此步骤的经济方法使酰基掩蔽的O-亲核试剂能够直接烷基化。该方法在碳水化合物合成中的应用是可行的,并且可以实现化学选择性。
Direct and efficient synthesis of unsymmetrical ethers from alcohols catalyzed by Fe(HSO4)3 under solvent‐free conditions
Highly efficient Fe(HSO4)3 catalyzed etherification of primary, secondary and tertiary benzylicalcohols with primary and secondary aliphatic alcohols is reported. The reaction affords unsymmetrical benzyl ethers in good to excellent yields under solvent-free conditions.
Aerobic oxidative deprotection of benzyl-type ethers under atmospheric pressure catalyzed by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)/tert-butyl nitrite
作者:Zhenlu Shen、Lili Sheng、Xiaochu Zhang、Weimin Mo、Baoxiang Hu、Nan Sun、Xinquan Hu
DOI:10.1016/j.tetlet.2013.01.045
日期:2013.3
efficient protocol for the oxidativedeprotection of benzyl-type ethers has been developed. The reaction was performed with catalytic amounts of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and tert-butyl nitrite (TBN) under atmospheric pressure of O2. Under the optimal reaction conditions, a variety of p-methoxybenzyl (PMB), p-phenylbenzyl (PPB), and benzyl (Bn) ethers can be deprotected to their
Benzylation of hydroxy groups with tertiary amine as a base
作者:Jeremiah W. Gathirwa、Toshihide Maki
DOI:10.1016/j.tet.2011.10.016
日期:2012.1
The benzylation of hydroxy groups in the presence of tertiary amines is described. A mixture of an alcohol and a benzyl halide afforded the corresponding benzyl ether in good to excellent yields in the presence of diisopropylethylamine. The importance of solventless conditions was observed. The reaction showed high tolerance to many functional groups including benzoate, even at a reaction temperature