Ammonium Chloride → HCID 57246043, compound

Participants

Reaction Steps

146 mg of copper (I) iodide was suspended in THF, and 3.85 ml of cyclohexyl magnesium chloride (2M diethyl ether solution) was added thereto under an argon atmosphere at -78° C. The mixture was stirred at the same temperature for ten minutes. Then, a THF solution (5 ml) of 969 mg of (2R,3S)-3-benzyloxy-1,2-epoxy-4-pentene was dropwise added thereto over a period of 10 minutes at -78° C. The mixture was stirred at -10° C. for two hours, and then poured into a saturated ammonium chloride aqueous solution and extracted with ethyl acetate. The extract layer was washed with a saturated sodium chloride aqueous solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain 1.2 g of (2R,3S)-3-benzyloxy-1-cyclohexyl-4-penten-2-ol as slightly brown oily substance. This alcohol was dissolved in DMF, and 923 mg of tert-butyldimethylsilyl chloride, 312 mg of 4 -dimethylaminopyridine and 923 μl of triethylamine were added thereto at 0° C. The mixture was stirred at room temperature overnight. Then, water and ethyl acetate were added to the reaction solution, and the organic layer was separated. The organic layer was washed sequentially with 1N hydrochloric acid, with 4% sodium hydrogencarbonate, with water and with a saturated sodium chloride aqueous solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (n-hexane/benzene=10/1) to obtain 1.3 g of the above identified compound as colorless oily substance.

Provenance & Evidence