反应详情

温度

-78 °C

A hexane solution of n-butyl lithium (1.68 M, 3.27 ml, 5.50 mmols) was dropwise added to a THF (30 ml) solution of ethyl 2-(6-bromo-2,3,4,5-tetramethoxybenzyl)-2-ethoxycarbonyl-6-(4-methoxycarbonylphenoxy)hexanoate (3.00 g, 4.58 mmols), under a nitrogen stream at −90° C. or lower, and stirring was continued for 15 minutes. Then, the temperature was raised to −78° C., and stirring was further continued for 15 minutes. To the reaction mixtures was added a THF (5 ml) solution of acetic acid (1.38 g, 22.9 mmols) at −70° C. or lower, which was then allowed to warm to room temperature, and a saturated aqueous sodium bicarbonate solution was added thereto, which was then extracted with diethyl ether. The organic layer waswashed with water and a saturated aqueous sodium chloride solution, and then dried. The solvent was evaporated out, and the resulting crude product was purified by recrystallization (from hexane-ethyl acetate) to obtain the entitled compound (1.22 g) as crystals.

1. stirringstirring
2. waitwas further continued for 15 minutes
3. customTo the reaction mixtures
4. temperatureto warm to room temperature
5. extractionwhich was then extracted with diethyl ether
6. dry with materiala saturated aqueous sodium chloride solution, and then dried
7. customThe solvent was evaporated out
8. customthe resulting crude product was purified by recrystallization (from hexane-ethyl acetate)