Water → HCID 19092538, compound

Participants

Reaction Steps

In 105 ml of anhydrous tetrahydrofuran, is dissolved 3.18 g of trans-3-hydroxy-6-cyano-3,4-dihydro-2,2-dimethyl-4-{1,2-dihydro-2-oxo-4-(2-t-butyldimethylsilyloxyethyl)-1-pyridinyl}-2H-benzo[b]pyran obtained in Example 23. Then, 0.28 g of 60% oily sodium hydride is added to the solution at room temperature and reacted under reflux for one hour. After stopping the reaction by adding water, the reaction mixture is extracted with ether. The organic layer is washed with saturated aqueous solution of sodium chloride and dried over anhydrous sodium sulfate. The inorganic matter is filtered off, and the filtrate is concentrated under reduced pressure. The residue thus obtained is purified by silica gel column chromatography using 1/4 mixture of ethyl acetate/methylene chloride as a developing solvent to obtain 2.01 g of 6-cyano-2,2-dimethyl-4-(1,2-dihydro-2-oxo-4-vinyl-1-pyridinyl)-2H-benzo[b]pyran.

Provenance & Evidence