反应详情

To a solution of 1.94 g 1-acetyl-4-piperidone in a mixture of ether (80 ml) and tetrahydrofuran (40 ml), was added dropwise at 10° C. or lower 275 ml of a 0.5M Grignard reagent prepared by the usual way from crotyl chloride and magnesium, and the resulting mixture was stirred overnight at room temperature. To the ice-cooled reaction mixture, was slowly added 100 ml of saturated aqueous solution of sodium chloride, and the layers were separated. The aqueous layer was extracted with chloroform, the two organic solutions were each concentrated, and the combined concentrate was subjected to silica gel column chromatography using, as eluent, a mixed solvent of ethyl acetate/n-hexane (1:1 by volume) containing 3% methanol, giving 16.9 g of 1-acetyl-4-hydroxy-4-(1-methyl-2-propenyl)piperidine as oil.

1. additionwas added dropwise at 10° C.
2. customreaction mixture
3. customthe layers were separated
4. extractionThe aqueous layer was extracted with chloroform
5. concentrationthe combined concentrate
6. additiona mixed solvent of ethyl acetate/n-hexane (1:1 by volume) containing 3% methanol