一种新型的仿生催化氧化系统,采用2,3-二氯-5,6-二氰基-1,4-苯醌(DDQ)作为催化剂,分子氧作为末端氧化剂,铁(II)酞菁(Fe II Pc)电子转移介体已经开发出来。该系统可用于PMB醚的氧化脱保护,醇氧化,芳构化和α,β-不饱和醛的形成。将Fe II Pc固定在多壁碳纳米管上后,可以重复使用而不会损失活性。
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
A Convenient Method for the Preparation of Symmetrical or Unsymmetrical Ethers by The Coupling of Two Alcohols via A New Type of Oxidation–reduction Condensation Using Tetrafluoro-1,4-benzoquinone
作者:Taichi Shintou、Teruaki Mukaiyama
DOI:10.1246/cl.2003.984
日期:2003.11
A new type of oxidation–reduction condensation by using tetrafluoro-1,4-benzoquinone (fluoranil), alcohols and alkoxydiphenylphosphines, in situ formed from nBuLi-treated alcohols and chlorodiphenylphosphine, proceeded smoothly to afford the corresponding symmetrical or unsymmetrical ethers in good to high yields.
Sulfated tungstate as hydroxyl group activator for preparation of benzyl, including <i>p</i>-methoxybenzyl ethers of alcohols and phenols
作者:Kamlesh V. Katkar、Sachin D. Veer、Krishnacharya G. Akamanchi
DOI:10.1080/00397911.2016.1230218
日期:2016.12.1
ABSTRACT Sulfated tungstate was found to be an effective heterogeneous and reusable catalyst for hydroxy group activation–mediated preparation of benzylic ethers including p-methoxybenzylic ethers of a wide range of alcohols and phenols under mild reaction conditions. GRAPHICAL ABSTRACT