SYNTHESIS AND REACTIONS OF SOME ETHYL 3(5)AROYL-4-ARYL-2-PYRAZOLINE-5(3)CARBOXYLATES

A series of ethyl 3(5)aroyl-4-aryl-2-pyrazoline-5(3)carboxylates 1 was prepared. Their reactions with bromine water, potassium permanganate and potassium hydroxide afforded the corresponding pyrazoles. With ary l and aroyl hydrazines the pyrazolines 1 gave the Schiff bases 9 while with hydrazine hydrate they yielded the corresponding acid hydrazides 11, Condensation of 11 with aromatic aldehydes gave the arylidene der ivatives 12, which, on cyclization with the propar reagent, afforded 1 3 or 14, Reaction of 1 with hydrochloric acid gave the corresponding d ipyrazolo-pyrazine derivatives 10.