Thermal condensation of 3-trifluoromethyl-/ and 3-amino-1-phenyl-2-pyrazoIin-5-ones with aromatic aldehydes.Synthesis of 4-arylidene-pyrazolones and pyrazolopyranopyrazoles

摘要

l-Phenyl-3-trifluoromethyl-2-pyrazolin-5-one 1 on heating with aromatic aldehydes at 160-70℃ affords the corresponding 4-arylidene-2-pyruzolin-5-ones 3.while 3-amino-l-phenyl-2-pyrazolin-5-one 2 on heating with aldehydes gives pyrazolo-pyranopyrazole derivatives 4 with high yields.These new products have been characterized by spectroscopic techniques and elemental analysis.