The next step is to convert the 2-keto-dihydropyrimidine to an enamine. This can be done by reacting the 2-keto-dihydropyrimidine with a secondary amine in the presence of a suitable base. The reaction forms the enamine intermediate.
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4,6-Dimethyl-7-phenyl-2-thioxo-1,3-diaza-bicyclo[4.2.0]oct-3-en-8-one
3-[4-(2-bromoacetyl)phenyl]-2H-chromen-2-one
