Thermal and acid-catalyzed transformations of 3H-pyrazoles obtained from diphenyldiazomethane and methyl phenylpropiolate

…, SE Duisenbaev, VV Razin, MA Kuznetsov…

Index: Fedorov; Duisenbaev; Razin; Kuznetsov; Linden Russian Journal of Organic Chemistry, 2007 , vol. 43, # 2 p. 231 - 240

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Citation Number: 6

Abstract

Abstract Reaction of diphenyldiazomethane with methyl phenylpropiolate in diethyl ether alongside the expected methyl triphenyl-3 H-pyrazole-4-and-5-carboxylates (I and II)(38 and 24%) gave rise also to 8% of methyl 3, 5-diphenyl-1-(1-ethoxyethyl)-1 H-pyrazole-4- carboxylate. The main thermolysis product obtained from 4-methoxy-carbonyl derivative I was methyl 1, 3, 5-triphenyl-1 H-pyrazole-4-carboxylate, whereas from regioisomer II ...