A photoredox and Brønsted acid synergistically catalyzed cross‐dehydrogenative C−Ocouplingreaction is developed in which isochroman peroxyacetals are formed through sp3 C−H bond peroxidation. The reported method is characterized by its extremely mild reaction conditions, excellent yields, and broad substrate scope. An oxocarbenium ion p‐chlorobenzenesulfonate was speculated to be the reactive intermediate
Scalable Aerobic Oxidation of Alcohols Using Catalytic DDQ/HNO<sub>3</sub>
作者:Tania Katsina、Louis Clavier、Jean-François Giffard、Nayane Macedo Portela da Silva、Jean Fournier、Rodolphe Tamion、Chloé Copin、Stellios Arseniyadis、Alexandre Jean
DOI:10.1021/acs.oprd.9b00513
日期:2020.5.15
A selective, practical, and scalable aerobic oxidation of alcohols is described that uses catalytic amounts of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and HNO3, with molecular oxygen serving as the terminal oxidant. The method was successfully applied to the oxidation of a wide range of benzylic, propargylic, and allylic alcohols, including two natural products, namely, carveol and podophyllotoxin
Catalytic Enantioselective Oxidative Cross-Coupling of Benzylic Ethers with Aldehydes
作者:Zhilin Meng、Shutao Sun、Huiqing Yuan、Hongxiang Lou、Lei Liu
DOI:10.1002/anie.201308701
日期:2014.1.7
The first one‐pot enantioselectiveoxidative coupling of cyclic benzylicethers with aldehydes has been developed. A variety of benzylicethers were transformed into the corresponding oxygen heterocycles with high enantioselectivity. Mechanistic experiments were conducted to determine the nature of the reaction intermediates. The application of this strategy to coupling reactions with other nucleophiles
Nitric acid-catalyzed aerobic oxidation of benzylic sp3 C H bonds of isochromans, xanthenes and 9-fluorenone under additive-free conditions
作者:Xinzhe Tian、Fangping Ren、Bo Zhao、Yun-Lai Ren、Shuang Zhao、Jianji Wang
DOI:10.1016/j.catcom.2017.12.006
日期:2018.3
HNO3 was demonstrated to be an effective catalyst for aerobic oxidation of benzylic sp3 CH bonds under additive-free conditions. A series of isochromans, xanthenes and fluorenes underwent this transformation to give the targeted products in low to high yields under the catalysis of HNO3, which provided an effective method for the synthesis of the synthetically and biologically valued isochromanones
HNO 3被证明是在无添加剂条件下有效氧化苄基sp 3 C H键的有效催化剂。在HNO 3的催化下,一系列异铬烷,黄嘌呤和芴经历了这种转化,以低到高收率得到了目标产物,这为合成和生物学上有价值的异铬烷酮,黄嘌呤和9-芴酮的合成提供了一种有效的方法。
Dehydrogenative Functionalization of C(sp3)-H Bonds Adjacent to a Heteroatom Mediated by Oxoammonium Salts
作者:Heinrich Richter、Olga García Mancheño
DOI:10.1002/ejoc.201000548
日期:——
mediated formation of C-C bonds from benzylicC(sp3 )-H bonds adjacent to an oxygen or nitrogen atom by dehydrogenativecoupling with enolizable carbonyls has been developed. The use of these oxidants in combination with catalytic amounts of Fe(OTf) 2 as Lewis acid allows the reaction to be carried out under mild conditions, leading to the corresponding coupling products in moderate to good yields
通过与可烯醇化羰基的脱氢偶联,由与氧或氮原子相邻的苄基 C(sp 3 )-H 键介导的第一种氧代铵盐介导形成 CC 键。这些氧化剂与作为路易斯酸的催化量的 Fe(OTf) 2 结合使用允许反应在温和的条件下进行,从而以中等至良好的产率产生相应的偶联产物。