反应详情

To a solution of (8E,12E,14E)-3,6,16,21-tetrakis(1-ethoxyethoxy)-7-hydroxy-6,10,12,16,20-pentamethyl-18,19-epoxytricosa-8,12,14-trien-11-olide (139 mg, 0.17 mmol) in dichloromethane (2.5 mL) were added triethylamine (88 mg, 0.87 mmol), N,N-dimethylaminopyridine (64 mg, 0.52 mmol) and 4-nitrophenyl chloroformate (105 mg, 0.52 mmol) under ice cooling, followed by stirring at room temperature under nitrogen atmosphere for one hour. The reaction mixture was diluted with ethyl acetate, and then washed with a saturated aqueous solution of sodium bicarbonate and brine. The organic layer was dried over anhydrous magnesium sulfate, filtrated and evaporated. The resulting residue was purified by silica gel column chromatography (Kanto silica gel 60N, 40 to 100 μm; ethyl acetate:hexane=20:80) to give the title compound (134 mg, 80%) as a colorless oil.

1. washwashed with a saturated aqueous solution of sodium bicarbonate and brine
2. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
3. filtrationfiltrated
4. customevaporated
5. customThe resulting residue was purified by silica gel column chromatography (Kanto silica gel 60N, 40 to 100 μm; ethyl acetate:hexane=20:80)