Abstract
1,2,3,4-Tetrahydrodipyrido[1,2- a :4,3- d ] pyrimidin-11-ones (2-azapyracridones), a novel type of heterocycles, were synthesized by cyclization of 2-amino-6-methylpyridine with 3-methoxycarbony1-4-piperidone or its N -benzyl derivative. In the presence of palladium-on-carbon under mild conditions, the 2-azapyracridones undergo intermolecular hydrogen-transfer reactions. The product distributions can be shifted by applying solvents of proton donor or proton acceptor character; in this way, three differently saturated members of this ring system were prepared.
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