A novel retrosynthetic approach to 3,5-diaryl-2-pyrazolines is provided by a three-component, one-pot reaction initiated by a palladium/copper-catalyzed cross-coupling (see scheme). The initially formed enone cyclocondenses in situ with the hydrazine to furnish the heterocycle. EWG=electron-withdrawing group.
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Müller et al. (2000) studied this question.