Nitrogen bridgehead compounds. Part 51 [1]. Autoxidation of 9-aminotetrahydro-4H-pyrido[1,2-a]pyrimidin-4-ones. Synthesis and stereochemistry of 9-amino- and 9-hydroxy-6,7-dihydro-4H-pyrido[1,2-a]-pyrimidin-4-ones

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