反应详情

温度

60 °C

To 0.8 g (3.5 mmoles) of 5,6-dihydro-6-methyl-11H-pyrido[2,3-b][1,5]benzodiazepin-5-one in 75 ml of dimethylformamide was added 0.2 g (4.0 mmol) of 50% sodium hydride in oil, and the reaction mixture was stirred at 60° C. for 2 h. It was then cooled to room temperature and 0.78 g (4.0 mmoles) of t-butyl bromoacetate was added dropwise, and the reaction mixture was allowed to stir overnight. Excess sodium hydride was carefully quenched with water and the solvent was evaporated. The residue was dissolved in methylene chloride, washed with water and dried over anhydrous sodium sulfate. Evaporation of the solvent gave 2.0 g of crude product. Purification by column chromatography (silica gel) using 10% ethyl acetate/methylene chloride afforded 0.52 g of pure 5,6-Dihydro-11-(t-butoxycarbonyl)methyl-6-methyl-11H-pyrido[2,3-b][1,5]benzodiazepin-5-one, m.p. 64°-65° C.

1. temperatureIt was then cooled to room temperature
2. stirringto stir overnight
3. customExcess sodium hydride was carefully quenched with water
4. customthe solvent was evaporated
5. dissolutionThe residue was dissolved in methylene chloride
6. washwashed with water
7. dry with materialdried over anhydrous sodium sulfate
8. customEvaporation of the solvent
9. customgave 2.0 g of crude product
10. customPurification by column chromatography (silica gel)