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It has been reported by the present authors that the reaction of aminotropones with diketene afforded the different kinds of products according to the reactivity of the starting aminotropones: 5-aminotropolone (1) afforded 5-acetoacetamidotropolone (2) and a pyridone derivative (3), 3) 4-aminotropolone (4) afforded a pyridone derivative (5) and a pyrone derivative (6), 1) 2-aminotropone (7) afforded 2-acetoacetamidotropone (8) and a pyrone derivative (9), 1) respectively.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Reaction of Aminotropones with Diketene. IV. Effects of the p&lt;I&gt;K&lt;/I&gt;&lt;SUB&gt;a&lt;/SUB&gt; Values of Aminotropones and Basic Catalysts on the Reaction of Aminotropones with Diketene