ABSTRACT:
Research Article
Synthesis of 1, 4- dihydropyrano [2, 3-c] pyrazole Derivatives
with no Catalyst under Ultrasound Irradiation
Wang Shu-Xiang *, Wang Wei, Li Ji-Tai
College of Chemistry and Environmental Science,
Hebei University,
Key Laboratory of Analytical Science and Technology, Baoding 071002,
Hebei Province, P. R. China.
A series of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1, 4-dihydropyrano [2, 3-c]pyrazoles were synthesized in 84%-95% yields by the condensation of aromatic aldehydes, malononitrile with 3-methyl-1-phenyl-2-pyrazolin -5-one with no catalyst under ultrasound irradiation.
