报道了一种实用简单且有用的方法,通过布朗斯台德酸催化活化源自醇的邻-[1-(对-MeO苯基)乙烯基]苯甲酸酯(PMPVB)供体来合成醚和硫醚。作用机制基于活性烯烃的远程活化,然后进行分子内 5-外触发环化,产生反应性中间体,该中间体可以通过底物依赖性 S N 1 或 S N 2 机制与醇和硫醇亲核试剂反应,从而提供容易的反应。分别获得醚和硫醚官能团。
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.
2,3-Dichloro-5,6-dicyano-1,4-benzoquinone-catalyzed aerobic oxidation reactions via multistep electron transfers with iron(<scp>ii</scp>) phthalocyanine as an electron-transfer mediator
作者:Yiming Hong、Tiantian Fang、Meichao Li、Zhenlu Shen、Xinquan Hu、Weimin Mo、Baoxiang Hu、Nan Sun、Liqun Jin
DOI:10.1039/c6ra08921f
日期:——
A new biomimetic catalytic oxidation system which employs 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as the catalyst, molecular oxygen as the terminal oxidant and iron(II) phthalocyanine (FeIIPc) as the electron-transfer mediator has been developed. This system can be applied for oxidativedeprotection of PMB ethers, alcohol oxidation, aromatization and α,β-unsaturated aldehyde formation. After
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。
2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)/tert-Butyl Nitrite/Oxygen: A Versatile Catalytic Oxidation System
作者:Zhenlu Shen、Jialiang Dai、Jie Xiong、Xijun He、Weimin Mo、Baoxiang Hu、Nan Sun、Xinquan Hu
DOI:10.1002/adsc.201100429
日期:2011.11
A new catalytic oxidation system using catalytic amounts of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and tert-butyl nitrite with molecular oxygen serving as the environmentally benign, terminal oxidant has been developed. This aerobic catalytic system was established for the selectiveoxidation of non-sterically hindered benzylic alcohols and electron-rich benzyl methyl ethers, and successfully