Chemoselective Oxidation of <i>p</i>-Methoxybenzyl Ethers by an Electronically Tuned Nitroxyl Radical Catalyst
作者:Shohei Hamada、Koichi Sugimoto、Elghareeb E. Elboray、Takeo Kawabata、Takumi Furuta
DOI:10.1021/acs.orglett.0c01839
日期:2020.7.17
The oxidation of p-methoxy benzyl (PMB) ethers was achieved using nitroxylradicalcatalyst 1, which contains electron-withdrawing ester groups adjacent to the nitroxyl group. The oxidative deprotection of the PMB moieties on the hydroxy groups was observed upon treatment of 1 with 1 equiv of the co-oxidant phenyl iodonium bis(trifluoroacetate) (PIFA). The corresponding carbonyl compounds were obtained
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