反应详情

To a solution of pyridine (1.64 ml) in dichloromethane (45 ml) was added chromium trioxide (1.07 g) at 10° C. and the solution was stirred at room temperature for 1 hour. The solution was cooled in an ice bath and was added (2R,4R,5S)-4-hydroxymethyl-5-[(Z)-6-methoxycarbonyl-2-hexenyl]-2-methyl-1,3-dioxane (500 mg) in dichloromethane (3 ml). After being stirred at room temperature for 2 hours, the solution was diluted with ether (100 ml) and passed through a silica gel column. The eluate was evaporated in vacuo and the residue was chromatographed on a silica gel column (20 g) with a mixture of n-hexane and ethyl acetate (1:1) as an eluent to give (2R,4R,5S)-4-formyl-5-[(Z)-6-methoxycarbonyl-2-hexenyl]-2-methyl-1,3-dioxane (336 mg) as a colorless oil.

1. temperatureThe solution was cooled in an ice bath
2. stirringAfter being stirred at room temperature for 2 hours
3. customThe eluate was evaporated in vacuo
4. customthe residue was chromatographed on a silica gel column (20 g) with a mixture of n-hexane and ethyl acetate (1:1) as an eluent