IMPROVEMENT OF THE ULLMANN'S CONDENSATION METHOD FOR THE SYNTHESIS OF 2-ANILINONICOTINIC ACIDS
作者:Houria Misbahi、Pierre Brouant、Jacques Barbe
DOI:10.1515/hc.2003.9.4.335
日期:2003.1
Several 2-anilinonicotinic acidderivatives were prepared under the UUmann's reaction conditions by condensation of 2chloronicotinic acid and various substitutedanilines. Improvement of the procedure based on the effect of the catalyst and that of the solvent on the reaction yields is reported.
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