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 new route to 2-(trifluoromethyl)benzimidazoles is described which involves the condensation of (2-arylamino)iminophosphoranes with trifluoroacetyl esters or trifluoroacetic anhydride. The method allows the synthesis of the title compounds from simple nitroarenes without the use of separate reduction steps and metallic reagents or expensive catalysts.
Synthesis of 2-Alkylidene-3-acylquinoxalines from N-Aryl-2-nitrosoanilines and 1,3-Diketones
作者:Zbigniew Wróbel、Adam Trawczyński
DOI:10.1055/s-0034-1379238
日期:——
In the reaction of N-aryl-2-nitrosoanilines with -diketones, a condensation of the nitroso group with diketone carbanion followed by condensation of the amino function with the less crowded carbonyl group leads to 2-alkylidene-3-acyl-1,2-dihydroquinoxalines under mild basic conditions.