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The Michael addition of enaminoesters to coumarins leads to the formation of the rearranged adduct  1  whose structure has been previously elucidated by X-ray crystallographic analysis. Now,  N-  and/or  O- carbamoylation of the 6-amino-2-pyridone  1  by treatment with phenyl isocyanate in a molar ratio of 1:1 and 1:2 gave  N -mono- ( 2a ) or  N,O -bis-(phenylcarbamoyl) ( 3 ) derivatives, respectively. Further transformations of the corresponding new 2-pyridone derivative  2a  into the  O- acetyl derivative  2b  and the chromeno[3,4- c ]pyridine  4  are reported as well.

Addition of some 6-amino-4-aryl-2(1 H )-pyridones to phenylisocyanate and related reactions