反应详情

[2-(5-Chloro-2-nitrophenyl)-1-(4-methoxyphenyl)ethyl]propanedioic acid, dimethyl ester (15.29 g, 36.25 mmole) was dissolved in dry dimethylformamide (100 ml) under argon. Prewashed (ether, 3 times), 50% sodium hydride (1.04 g, 43.3 mmole) was added with stirring. (The mixture turned from yellow to a dark red color). Stirring was continued for 20 minutes before iodoethane (14.5 ml, 28.3 g, 181 mmole, 5 eq) was added dropwise, and the reaction mixture was allowed to stir for an additional 2 hours. The solution was diluted with ether and washed with water. The organic layer was dried (magnesium sulfate), concentrated, and vacuum-dried overnight to yield 17.65 g of crude product as a light yellow oil. This material was triturated with methanol leaving 12.73 g of white solid, melting point 95.5°-97.0° C. Additional product was present in the mother liquor.

1. stirringStirring
2. additionwas added dropwise
3. stirringto stir for an additional 2 hours
4. washwashed with water
5. dry with materialThe organic layer was dried (magnesium sulfate)
6. concentrationconcentrated
7. customvacuum-dried overnight