反应详情

To a mixture of 0.81 g of 4-hydroxy-3-[3-(3-methylphenyl)-1-oxo-2-propenyl]-6-methyl-2H-pyran-2-one, 10 ml of tetrahydrofuran, 0.25 ml of 2-methoxyethanol, and 0.87 g of triphenylphosphine was added dropwise a solution of 0.57 g of diethyl azodicarboxylate in 6 ml of tetrahydrofuran, and this was stirred at room temperature overnight. The solvent was distilled off under reduced pressure, and the resulting residue was subjected to silica gel column chromatography to obtain 389 mg of 4-(2-methoxyethoxy)-3-[3-(3-methylphenyl)-1-oxo-2-propenyl]-6-methyl-2H-pyran-2-one [Compound No. (2a-24)] as a yellow oil.

1. distillationThe solvent was distilled off under reduced pressure