Water → 5-(2-fluorophenyl)-7-nitro-3H-1,4-benzodiazepine-2(1H)-thione

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A solution of 20.0 g of 5-(2-fluorophenyl)-7-nitro-3H-1,4-benzodiazepin-2(1H)-one (G. M. Clarke, J. B. Lee, F. J. Swinbourne & B. Williamson, J. Chem. Res. Synop. 1980, 400) in 100 ml of hexamethylphosphoric acid triamide was treated with 14 g of Lawesson reagent and the mixture was stirred at 105° C. for 70 min. The reaction mixture was poured into 800 ml of saturated aqueous sodium hydrogen carbonate solution and 800 ml of water. After stirring at room temperature for 15 min. the precipitate was filtered off, washed with water and dried. There were obtained 20 g of crude 5-(2-fluorophenyl)-7-nitro-3H-1,4-benzodiazepine-2(1H)-thione, which was used in this form for the next step.

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