Heterocycles from Pyrazoloylhydroximoyl Chloride: Synthesis of Certain Quinoxaline, Benzothiadiazine, Benzoxadiazine, Quinazolinone, Imidazo[1,2-a]pyridine, Imidazo[1,2-a]pyrimidine, Isoxazole, Pyrazolo[3,4-d]pyridazine and Pyrrolidino[3,4-d]isoxazolin-4,
作者:Hussein F. Zohdi、Tabia A. Osman、Abdou O. Abdelhamid
DOI:10.1002/jccs.199700095
日期:1997.12
Abstract3‐Ethoxycarbonyl‐5‐methyl‐1‐(4‐methylphenyl)‐4‐pyrazoloylhydroximoyl chloride (1) reacted with o‐phenylenediamine, o‐aminothiophenol, o‐aminophenol and methyl anthranilate to afford 3‐nitrosoquinoxaline, benzothiadiazine, benzoxadiazine, and 3‐hydroxyquinazoline, respectively. Imidazo[1,2‐a]pyridine, imidazo[1,2‐a]pyrimidine and isoxazole derivatives were obtained via the reaction of 1 with 2‐aminopyridine, 2‐aminopyrimidine and the appropriate active methylene compounds, respectively. Pyrazolo[3,4‐d]pyridazines, and pyrrolidino[3,4‐d]isoxazolines derivatives were also synthesized. The structures of the newly synthesized compounds were established on the basis of spectral data and alternate synthesis whenever possible.