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-pyrazolo[3,4-b]quinolin-4-one
作者:Melinda Gál、Ödön Fehér、Endre Tihanyi、Gyula Horváth、Gyula Jerkovich、Gyula Argay、Alajos Kálmán
DOI:10.1016/s0040-4039(00)92777-1
日期:1980.1
The conversion of 1-(2-amino)-benzoyl-1-methylhydrazones of β-dicarbonylcompounds into heterocyclic derivatives yielded in addition to the already known type of product further three novel pyrazole derivatives , and . The structures of these products have been established by chemical and spectroscopic (MS) methods. The crystal structure of has been determined by X-ray diffraction.
A novel rearrangement was observed during the cyclization of N-(2-aminobenzoyl)-N-methylhydrazones of β-dicarbonylcompounds, leading to pyrazole derivatives 2,4, and 5 depending on substituents and the reaction media.