A one-pot direct regioselective iodination of Fischer-Borsche product using periodic acid in PEG-400
摘要:
A metal-free and greener approach for the one-pot direct iodination and dehydrogenation of dihydrobenzo[a]carbazoles has been developed using periodic acid in polyethylene glycol-400 (PEG-400) under mild condition. This method has been proven to be tolerate to a broad range of functional groups, with good to excellent yields include metal-free inexpensive catalyst, easy work-up, benign reaction condition and high regioselectivity. The solvent has been successfully recycled up to 5 times without any loss of activity in an aqueous medium. (C) 2019 Elsevier Ltd. All rights reserved.
The Fischerindolesynthesis was carried out using microwaves instead of conventional heating procedures. When the mixture of phenylhydrazine, cyclohexanone and zinc chloride was irradiated at 600 W for 3 min, 76% of 1,2,3,4‐tetrahydrocarbazole was obtained. However, when zinc chloride was replaced with p‐toluenesulfonic acid (p‐TSA), the reaction yielded 91% of 1,2,3,4‐tetrahydrocarbazole. Thus, a
Copper-mediated rapid and facile oxidative dehydrogenation of dihydrobenzocarbazoles
作者:Vivek T. Humne、Avinash G. Ulhe
DOI:10.1080/00397911.2020.1731757
日期:2020.4.2
Rapid method for the oxidative dehydrogenation of dihydrobenzocarbazoles has been introduced by using bench scale and commercially available reagent; copper chloride, in excellent yield with easy workup. The scope of the reaction has been studied with broad range of substitutes