[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[C:14]2[CH:15]=[C:16]([I:19])[CH:17]=[CH:18][C:13]=2[NH:12][C:11](=O)[CH2:10][N:9]=1.P12(SP3(SP(SP(S3)(S1)=S)(=S)S2)=S)=[S:22].C(=O)(O)[O-].[Na+].COCCOCCOC>O>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[C:14]2[CH:15]=[C:16]([I:19])[CH:17]=[CH:18][C:13]=2[NH:12][C:11](=[S:22])[CH2:10][N:9]=1A mixture of 31 g (0.08 mol) of 1,3-dihydro-5-(2-fluoro phenyl)-7-iodo-1,4-benzodiazepin-2(2H)-one [ref. G. F. Field and L. H. Sternbaoh, Swiss patents Nos. 561,706; May 1975; and 562,222; April 1975], 20 g (0.09 mol) of phosphorus pentasulfide, 20 g of sodium bicarbonate and 300 ml of diglyme was stirred and heated to 80°-85° C. for 3 hours. The reaction mixture was then poured onto ice and diluted with water. After stirring for 30 minutes, the solid yellow product was filtered off, washed with water, 2-propanol and little ether. It was sucked dry in the funnel and further dried in vacuum to leave 26 g (80%) of 1,3-dihydro-5-(2-fluorophenyl)-7-iodo-1,4-benzodiazepine-2(2H)-thione which was further transformed as described below. Pure material was obtained by recrystallization from tetrahydrofuran/ethanol and had m.p. 242°-244° C.
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