反应详情

A 250 mL three necked round bottom flask equipped with a mechanical stirrer, addition funnel, thermometer, and a reflux condenser is charged with (2R)-2-(4-nitrophenyl)propan-1-ol (2.0 g, 11.04 mmol), phthalimide (1.62 g, 11.04 mm), triphenylphosphine (4.3 g, 16.59 mmol) and THF (50.0 mL) at room temperature. To this solution was added DEAD (2.6 mL, 16.59 mmol) over a period of 5 minutes (reaction exothermed to reflux by the end of addition). The reaction was then stirred to room temperature overnight for convenience, quenched with water (50.0 mL) and extracted organic with methylene chloride (50.0 mL). The organic layer was then dried with anhydrous magnesium sulfate, filtered, and concentrated under reduced pressure at 50° C. to an oil (11.62 g). Plug filtration of the oil over silica gel with 1:1 ethyl acetate/hexane (470.0 mL) and subsequent concentration of the fractions containing product afforded a light yellow precipitate. The precipitate was then dried in a house vacuum at 40° C. to provide 2-[(2R)-2-(4-nitrophenyl)propyl]isoindoline-1,3-dione (3.32 g, 96.9%); 1H nmr (CDCl3, 300 MHz) δ 1.50 (d, 3H, J=6.74 Hz), 3.45 (m, 1H), 3.89-3.95 (m, 2H), 7.5 (d, 2H), 7.67 (m, 2H), 7.68 (m, 2H), 8.10 (d, 2H); 13C nmr (CDCl3, 300 MHz δ 19.21, 38.90, 44.45, 123.59, 123.99, 128.50, 131.86, 134.35, 151.13, 168.34.

1. customreaction exothermed
2. temperatureto reflux by the end of addition)
3. customquenched with water (50.0 mL)
4. extractionextracted organic with methylene chloride (50.0 mL)
5. dry with materialThe organic layer was then dried with anhydrous magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure at 50° C. to an oil (11.62 g)
8. filtrationPlug filtration of the oil over silica gel
9. concentrationwith 1:1 ethyl acetate/hexane (470.0 mL) and subsequent concentration of the fractions
10. additioncontaining product
11. customafforded a light yellow precipitate
12. customThe precipitate was then dried in a house vacuum at 40° C.