Water → 4-hydroxy-3-[3-[3-(cyanomethoxy)phenyl]-1-oxo-2-propenyl]-2H-1-benzopyran-2-one

Beteiligte Stoffe

Reaktionsschritte

In 5 ml of chloroform were dissolved 0.57 g of 3-acetyl-4-hydroxy-2H-1-benzopyran-2-one, 0.45 g of 3-(cyanomethoxy)benzaldehyde and 0.20 g of piperidine, and the solution was heated under refluxing for 1 hour and 30 minutes while water was removed with a Soxhlet's extractor filled with a molecular sieve. After cooling to room temperature, the reaction mixture washed successively with 10% hydrochloric acid and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated. Precipitated crystals were washed with a mixture of 10 ml of dioxane and 10 ml of chloroform, and washed with 10 ml of t-butyl methyl ether to obtain 0.56 g of 4-hydroxy-3-[3-[3-(cyanomethoxy)phenyl]-1-oxo-2-propenyl]-2H-1-benzopyran-2-one [Compound No. (14d)] as a yellow crystal.

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