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Paper | Regular issue | Vol 89, No. 3, 2014, pp.641-651
Published online, 24th January, 2014
DOI: 10.3987/COM-13-12910
Synthesis of Pyrazoles Based on Functionalized Allenoates

Ilshat M. Sakhautdinov,* Aynur M. Gumerov, Ilnur R. Batyrshin, Akhnaf A. Fatykhov, Kyrill Yu. Suponitsky, and Marat S. Yunusov

*Institute of Organic Chemistry, Bioorganic Chemistry, Ufa Research Centre, Russian Academy of Sciences, Prospect Oktyabrya, 71, 450054, Ufa, Russia

Abstract

Regiospecific synthesis of pyrazole-3-carboxylate derivatives by 1,3-dipolar cycloaddition of diazomethane with allenoates in presence of triethylamine is demonstrated. Reaction of allenoates with stearic acid moiety containing diazoketone is explored under ultrasonic conditions. Novel derivatives of pyrazole were achieved in excellent yields.