Action of carbon disulfide and phenylthioisocyanate on naphthopyrane derivatives: Production of naphtopyranopyrimidodithiones and naphtopyranopyrimidothiones
Naphtopyranes 1 react with carbon disulfide and phenylthioisocyanate to give the naphtopyranopyrimidodithiones 3 and the naphtopyranopyrimido-thiones 4 respectively. The structure of products 3 and 4 is confirmed by IR, NMR, and for some of the compounds