Wang Liju and Keyume Ablajan Pages 310 - 316 ( 7 )
Pyrrolidine was used as a catalyst for the simple, convenient, and highly efficient synthesis of dihydropyrano[2,3-c]pyrazole derivatives. Four-component one-pot reactions of β-ketoester, hydrazine, ethyl glyoxalate or ethyl pyruvate, and malononitrile in ethanol under reflux conditions led to excellent yields of 79%-94%.
Dihydropyrano[2, 3-c]pyrazole, multi-component reactions, one-pot synthesis, Pyrrolidine, Triazolo[4, 3-a]pyrimidines.
Key Laboratory of Oil & Gas Fine Chemicals, Ministry of Education & Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, P.R. China.