Heterocyclic Compounds
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ChemInform Abstract: Synthesis of 4-Aryl-3-(2-chromonyl)-2-pyrazolines by the 1,3-Dipolar Cycloaddition of 2-Styrylchromones with Diazomethane.
First published: 20 June 2010
Abstract
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ChemInform Abstract
Styrylchromones (III) are prepared in good overall yield in a three-step sequence. The title cycloaddition of (III) with diazomethane (IV) provides substituted 2-pyrazolines (V), after spontaneous isomerization of 4-aryl-3-(2-chromonyl)-1-pyrazolines, as major products along with 1-pyrazolines (VI) as minor products.
