反应详情

57.5 g (0.18 M) of (S)-5-(o-fluorophenyl)-1,3-dihydro-3-methyl-7-nitro-2H-1,4-benzodiazepin-2-one are dissolved in 600 ml of absolute acetone. The solution is treated with 48 g of powdered potassium carbonate and 21 ml of methyl iodide and stirred at room temperature for 5 hours. The mixture is concentrated and the residue is treated with ice-water and extracted several times with methylene chloride. The methylene chloride solution is washed with water, dried over sodium sulphate, filtered and concentrated. The residue is crystallised from ether/petroleum ether and there is obtained (S)-5-(o-fluorophenyl)-1,3-dihydro-1,3-dimethyl-7-nitro-2H-1,4-benzodiazepin-2-one which melts at 118°-126° C. with decomposition; [α]25D =+563.1° (n methylene chloride; 1%).

1. concentrationThe mixture is concentrated
2. additionthe residue is treated with ice-water
3. extractionextracted several times with methylene chloride
4. washThe methylene chloride solution is washed with water
5. dry with materialdried over sodium sulphate
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue is crystallised from ether/petroleum ether