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Paper | Regular issue | Vol 78, No. 8, 2009, pp.2003-2012
Published online, 9th April, 2009
DOI: 10.3987/COM-09-11686
Synthesis of Fused Pyrazolo[1,5-a]pyrimidine Derivatives under Microwave Irradiation and Ultrasound, as Ecofriendly Energy Sources

Khadijah M. Al-Zaydi*

*Chemistry Department, Girl’s College of Education, King Abdul-Aziz University, Jeddah 21533 P.O.Box 50918, Saudi Arabia


4-(4-Chlorophenylazo)-1H-pyrazole-3,5-diamine reacted with ethyl acetoacetate, benzylidenemalononitrile, ethyl propiolate and malononitrile under microwave irradiation to afford pyrazolo[1,5-a]pyrimidine derivatives in high yields. The structures of compounds were confirmed by 1H, 13C NMR, MS, elemental analyses and X-ray crystallography.