论文信息 - A facile synthesis of novel 1-aryl-1 H -pyrazolo[3,4- b ]quinoxalines

A facile synthesis of novel 1-aryl-1 H -pyrazolo[3,4- b ]quinoxalines

The reactions of 3-methyl-2-oxo-1,2-dihydroquinoxaline 3 with chlorophenyl diazonium salts afforded the hydrazones 4a-c, whose chlorinations with phosphoryl chloride gave the dichlorides 5a-c. Refluxing of the dichlorides 5a-c and base in N,N-dimethylformamide provided the 1-aryl-1H-pyrazolo[3,4-b]quinoxalines 6a-c.

Y. Okamoto | A. Takada | K. Yamazaki | Y. Kurasawa | S. Tajima

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