【摘 要】
：
A convenient synthesis of 6-amino-2H,4H-pyrano[2,3-F]pyrazole-5-carbonitriles has been accomplished by one pot four-component cyclocondensation of aromatic alde
【机 构】
：
Department of Chemistry,Dr.Babasaheb Ambedkar Marathwada University,
【出 处】
：
Chinese Chemical Letters
论文部分内容阅读
A convenient synthesis of 6-amino-2H,4H-pyrano[2,3-F]pyrazole-5-carbonitriles has been accomplished by one pot four-component cyclocondensation of aromatic aldehydes(1a-o) malanonitrile(2), ethyl acetoacetate(3), and hydrazine hydrate(4) in freshly prepared deep eutectic solvent, DES(choline chloride:urea). This protocol has afforded corresponding pyrano[2,3-F]pyrazoles in shorter reaction time with high yields, and it avoids the use of typical toxic catalysts and solvents.
Pyrazole-5-carbonitriles have been accomplished by one pot four-component cyclocondensation of aromatic aldehydes (1a-o) malanonitrile (2), ethyl acetoacetate (3), and hydrazine hydrate (4) in freshly prepared deep eutectic solvent, DES (choline chloride: urea). This protocol has afforded corresponding pyrano [2,3-F] pyrazoles in shorter reaction time with high yields, and it avoids the use of typical toxic catalysts and solvents.
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