PHOTOCHIMIE D'HETEROCYCLES AZOTES-VI. SYNTHESE PAR VOIE PHOTOCHIMIQUE D'AMINO ET D'ALKOXY INDAZOLES

Article abstract of DOI:10.1016/0040-4020(80)88048-3

The preparation of different aminoindazoles by nucleophilic aromatic photosubstitution of nitroindazoles by amines is described.In this manner, the amino, methylamino, dimethylamino and diethylamino substituents are introduced in 3, 4, 5 or 7-position.The irradiation in the presence of ethanol gives ethoxyindazoles in only four cases.Two demethylation reactions have been observed: the first one concerns the formation of methylamino derivatives starting from dimethylamine; the second one, the formation of N(H)1-indazoles by irradiation in presence of diethylamine.