J. V. Allan, G. Reynolds
Feb 1, 1976
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Journal
Journal of Heterocyclic Chemistry
Abstract
2,6-Diphenyl-4H-pyran-4-one in the presence of phosphorus oxychloride reacted with phenothiazine to give a pyryliurn salt which was bonded in the 4-position to the nitrogen atom of phenothiazine. Carbazole gave a similar type of product. When the N-methyl derivatives of phenothiazine and carbazole were allowed to react under the same conditions, the coupling took place on the phenyl ring para to the nitrogen atom. In contrast to phenothiazine, benzo[a]-phenothiazine gave a product arising by coupling into the phenyl ring.