| 摘要 |
2-Substituted amino derivatives of 6-amino-3-chloro-5-nitropyrazin-2-yl are prepared by converting 3-amino-5,6-dichloropyrazinecarboxylic acid to 5,6-dichloro-3-nitropyrazinamine and treating said compound with an amine to produce the corresponding 2-substituted amino compound. 2,6-Di(alkylamino) derivatives of chloronitropyrazines are prepared from dichloronitropyrazinamine by diazotization of the amine followed by halogen exchange to produce an intermediate dichloro-halo nitropyrazine followed by reaction with one or two moles of an alkyl amine to effect replacement of one or two of the pyrazine halogens. N-acyl derivatives of 6-(alkylamino)-5-chloro-3-nitropyrazinamines are prepared by treatment of 5,6-dichloro-3-nitropyrazinamine with an acylating agent to produce the corresponding acylated pyrazinamine followed by treatment of said acylate dpyrazinamine with a lower alkylamine to replace one of the chloro substituents and produce a 2-acylamino-6-(alkylamino)-5-chloro-3-nitro pyrazinamine. |
