Synthesis of Pyrazolone Derivatives. XXIX. Synthesis of 1, 3-Dioxolane-indazole Derivatives

Abstract

Several 2'-phenyl-spiro [1, 3-dioxolane-2, 5'-indazoles] having alkyl or alkoxy side chains at 1'(III), 3'a (IV) and 3'(V) were prepared as analgesic agents. III and IV were derived to oxo-indazoles (VII, VIII), which were hydrogenated to give the corresponding hydroxy indazoles (IX, X). Some of these compounds showed slight analgesic activity.