Hydrochloric Acid → HCID 19092510, compound

Participants

Reaction Steps

In 11.5 ml of methanol, is dissolved 1.16 g of 6-cyano-2,2-dimethyl-4-(1,2-dihydro-2-oxo-5-t-butyldimethylsilyloxymethyl-1-pyridinyl)-2H-benzo[b]pyran obtained in Example 13. Then, 2.87 ml of 4N hydrochloric acid in dioxane is added to the solution at 0° C., and reacted at room temperature for 1.5 hours. After stopping the reaction by adding water, the reaction mixture is extracted with ethyl acetate. 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 1/20 mixture of methanol/methylene chloride as a developing solvent to obtain 0.80 g of 6-cyano-2,2-dimethyl-4-(1,2-dihydro-2-oxo-5-hydroxymethyl-1-pyridinyl)-2H-benzo[b]pyran.

Provenance & Evidence