Solvent-Controlled, Regio-Switchable Formation of 3-/5-Arylaminopyrazole Isomer in Cyclocondensation of β-Aminoenones with Hydrazides: Intermolecular Hydrogen Bonding Plays a Role.

2013

The regiochemical course of the ring transformation of semicyclic β-aminoenones (I) with methylhydrazine (II) is shown to be solvent-controlled.

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