Methyl iodide → (S)-5-(o-fluorophenyl)-1,3-dihydro-1,3-dimethyl-7-nitro-2H-1,4-benzodiazepin-2-one

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Reaction Steps

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° (in methylene chloride; 1%).

Provenance & Evidence