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Iodine catalyzed one-pot reactions of salicylaldehyde and dimolecular 1 H-indene-1,3(2H)-dione,barbituric acids,4-hydroxycoumarin, or 4-hydroxy-6-methylpyran-2-one were performed and provided a rapid,convenient and general approach to synthesize the chromene derivatives.2-(11-Oxo-10,11-dihydroindeno[l,2-b]chromen-10-yl)-1H-indene-1,3(2H)-diones P1-P4 and 10-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-3-methylpyrano[4,3-6]chromen-1(10H)-ones P8-P9 were unprecedentedly prepared and structurally identified by NMR and Mass.The confirmation of structure by single crystal X-ray crystallography is reported for P3.
Iodine catalyzed one-pot reactions of salicylaldehyde and dimolecular 1 H-indene-1,3 (2H) -dione, barbituric acids, 4-hydroxycoumarin, or 4-hydroxy- 6-methylpyran-2-one were all performed with a rapid, convenient and general approach to synthesize the chromene derivatives. 2- (11-Oxo-10,11-dihydroindeno [1,2-b] chromen-10-yl) -1H-indene- P4 and 10- (4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl) -3-methylpyrano [4,3-6] chromen-1 and structurally identified by NMR and Mass. The confirmation of structure by single crystal X-ray crystallography is reported for P3.