Reductive Condensation of a Nitro Group with Carboxylic Acids Promoted by Phosphorus(III) Compounds: A Short Route to 5H-Dibenzo[b,e][1,4]diazepin-11(10H)-ones
Abstract Tributyl- or triphenylphosphine promotes a one-pot, three-step method for the synthesis of differently substituted dibenzodiazepinones from N-aryl-2-nitroanilines. Pyridine analogues and the corresponding thiazepinones can also be formed using this method. The process involves deoxygenation of the nitro group, then formation of an iminophosphorane intermediate and its intramolecular condensation
A One-Pot Transition-Metal-Free Tandem Process to 1,4-Benzodiazepine Scaffolds
作者:Xiaoqun Cao、Chen Ma、Yanqiu Li、Chunjing Zhan、Bingchuan Yang
DOI:10.1055/s-0032-1317781
日期:——
An efficient and practical method for the synthesis of 1,4-benzodiazepines is reported. This methodology offers a transition-metal-free tandem process in one pot. This process is applicable to the construction of a wide variety of 1,4-benzodiazepines and other tricyclic systems with high potential biological and pharmacological activities.