Antinociceptive pyrimidine derivatives: aqueous multicomponent microwave assisted synthesis
作者:Augusto L. Xavier、Alfredo M. Simas、Emerson P. da S. Falcão、Janaína V. dos Anjos
DOI:10.1016/j.tetlet.2013.04.099
日期:2013.6
Pyrimidines and their oxo-derivatives are well researched due to their anti-inflammatory, analgesic, antimicrobial, antiviral, and interferon inducing activities. New pyrimidine derivatives are therefore frequently synthesized to build up small molecule libraries for the discovery of drug candidates. Synthesis of 2,6-diaryl-4-(3H)-pyrimidinones and 2,6-diaryl-4-aminopyrimidines is traditionally a 2-day laboratory effort carried out in two steps, always using ethanol as solvent, and triethylamine as base. In this Letter, we advance a one-step alternative synthetic method with a 40 min reaction time using a microwave reactor in an aqueous media with potassium carbonate as base. The average yields were also somewhat improved. This new method thus emerges as more eco-friendly, not only because it does not employ triethylamine as base, but also due to a much reduced usage of organic solvents, leading to less harmful residues. Using this method, we synthesized twenty pyrimidine derivatives with antinociceptive activities in satisfactory chemical yields. (C) 2013 Elsevier Ltd. All rights reserved.