反应详情

温度

0 °C

To a solution of E/Z-6-chloro-3-(3-chloro-benzylidene)-1,3-dihydro-indol-2-one prepared in example 1a (2.3 g, 7.9 mmol) in N,N-dimethyl-formamide (20 mL) at 0° C. was added NaH (60% in mineral oil) (0.32 g, 7.9 mmol) (Aldrich), followed by the dropwise addition of 2-(trimethylsilyl)ethoxymethyl chloride (1.32 g, 7.9 mmol) in tetrahydrofuran (20 mL). The reaction mixture was stirred at 0° C. for 0.5 h, then poured into ice-water. The crude was extracted with ethyl acetate twice. The combined organic layer was dried over Na2SO4. The solvent was removed and the residue was purified by chromatography (EtOAc:hexanes=1:5) to give E/Z-6-chloro-3-(3-chloro-benzylidene)-1-(2-trimethylsilanyl-ethoxymethyl)-1,3-dihydro-indole-2-one as yellow oil (Yield 3.0 g, 90%).

1. extractionThe crude was extracted with ethyl acetate twice
2. dry with materialThe combined organic layer was dried over Na2SO4
3. customThe solvent was removed
4. customthe residue was purified by chromatography (EtOAc:hexanes=1:5)