Abstract
Abstract3‐Methyl‐1H‐naphtho[2,1‐b]pyran‐1‐one 1 has been shown to react with various aldehydes to give the styryl derivatives 2. Reaction of 1 with P2S5 gave the thio‐derivative 3 which reacted with aldehydes giving the thiostyryl‐derivatives 4. Hydroxylamine reacted with 1 giving the isoxazole derivative 5. Hydrazine reacted with 2 giving the pyrazole derivative 6. Compounds 2 have been shown to undergo DIELS‐ALDER reaction to give the adducts 7, 8 and 9. When 1 was allowed to react with different dicarboxylic acid anhydrides, the phthalide derivatives 10 were obtained, which on reaction with phenol, gave the dihydroxyphthalophenones 11.
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