THE RING CLOSURE AND REARRANGEMENT OF 1-(2-AMINO)-BENZOYL-1-METHYLHYDRAZONES OF β-DICARBONYL COMPOUNDS: ON THE FORMATION AND CRYSTAL STRUCTURE OF 3a,9a-DIHYDRO-1,3,3a,9a-TETRAMETHYL-4H-PYRAZOLOQUINOLIN-4-ONE

Article abstract of DOI:10.1016/S0040-4039(00)92777-1

The conversion of 1-(2-amino)-benzoyl-1-methylhydrazones of β-dicarbonyl compounds into heterocyclic derivatives yielded in addition to the already known type of product 2 further three novel pyrazole derivatives 3, 4, and 5.The structures of these products have been established by chemical and spectroscopic (MS) methods.The crystal structure of 5 has been determined by X-ray diffraction.