Syntheses of Pyrimidinylhydrazones of 4-Biphenylylglyoxal

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To search for antimicrobial agent, 2-hydrazino-4-alkoxy-6-methylpyrimidine, 2-hydrazino-4-alkylthio-6-methylpyrimidine, and 2-alkylthio-4-hydrazino-6-methylpyrimidine were synthesized by the hydrazination of the corresponding 2-chloro- and 4-chloropyrimidine with hydrazine hydrate, and it was found that chlorine atom at 2-position or 4-position in pyrimidine ring, is more reactive on hydrazine than alkylthio and alkoxy group at 4- or 2-position. These hydrazinopyrimidines of the three series were converted into pyrimidinylhydrazones of 4-biphenylylglyoxal by the condensation with 4-biphenylylglyoxal.

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