Synthesis of 4??Aryl??3??(2??chromonyl)??2??pyrazolines by the 1, 3??dipolar cycloaddition of 2??styrylchromones with diazomethane

…, A Silva, LMPM Almeida, JAS Cavaleiro…

Index: Pinto, Diana C.G.A.; Silva, Artur M.S.; Almeida, Lucia M.P.M.; Cavaleiro, Jose A.S.; Levai, Albert; Patonay, Tamas Journal of Heterocyclic Chemistry, 1998 , vol. 35, # 1 p. 217 - 224

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Citation Number: 34

Abstract

Abstract The first reported 1, 3-dipolar cycloaddition of 2-styrylchromones with diazomethane afforded 4-aryl-3-(2-chromonyl)-2-pyrazolines. However, 3-aryl-4-(2- chromonyl)-1-pyrazolines have been also found as minor products of this reaction. These two series of pyrazolines have been fully characterized.