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2-Aminobenzamide reacts with not only keton radical but also carbonyl group in carboxylic acid to form easily -N-C-N-aovel ring cyclization as a result ?1 and Y. In addition, it reacts with 1, 2-cyclohexadione or benzil, whitch are both 1, 2-diketone compounds, at the both ketone radical sites to give V or W respectively. On the reaction with dimethone, however, which has 1, 3-diketone radical, it reacted with only one carbonyl group and M was produced. We investigated the reaction with a-ketoester such as ethyl pyruvate and diethyl mesoxalate. In the reaction with ethylpyruvate, amine group in 2-aminobenzamide reacted not with ketone radical but carbonyl group in ester (product WI). On the other hand, diethyl measoxalate reacted at the ketone radical site rather than the ester site (product IX).
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