Dipotassium Hydrogen Phosphate Powder Catalyzed Conversion of Dimethyl-2-(5-bromo-2-hydroxyphenyl)-3-(triphenylphosphoranylidene)butanedioate to Methyl-6-bromo-2-oxo-2H-chromene-4-carboxylate

摘要

Dipotassium hydrogen phosphate powder was found to catalyze conversion of dimethyl 2-(5-bromo-2-hydroxy-phenyl)-3-(triphenylphosphoranylidene)butanedioate to methyl 6-bromo-2-oxo-2H-chromene-4-carboxylate in solvent-free conditions at room temperature in fairly high yield.