[Cl:1][C:2]1[CH:23]=[C:22]([N+:24]([O-])=O)[CH:21]=[CH:20][C:3]=1[C:4]([N:6]1[C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=2[N:10]2[CH:17]=[CH:18][CH:19]=[C:9]2[CH2:8][CH2:7]1)=[O:5].O.O.Cl[Sn]Cl>C(O)C.O1CCCC1>[NH2:24][C:22]1[CH:21]=[CH:20][C:3]([C:4]([N:6]2[C:12]3[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=3[N:10]3[CH:17]=[CH:18][CH:19]=[C:9]3[CH2:8][CH2:7]2)=[O:5])=[C:2]([Cl:1])[CH:23]=1To a solution of 0.50 g of 6,7-dihydro-5-(2-chloro-4-nitrobenzoyl)-5H-pyrrolo[1,2-a][1,5]benzodiazepine in 10 ml of ethyl alcohol and 2 ml of tetrahydrofuran is added 2.35 g of SnCl2.2H2O and the mixture stirred at 55° C. for 30 minutes. The solvents are evaporated in vacuo to a residue which is stirred with 20 ml of 1N NaOH and 40 ml of ethyl acetate for 15 minutes and filtered through diatomaceous earth. The filter pad is washed with 2×10 ml of ethyl acetate and the combined extracts washed with brine, dried Na2SO4) and evaporated in vacuo to give 0.47 g of solid residue which is triturated with ether-hexane to give 0.43 g of light yellow crystalline solid. MS(CI): 338(M+H, Cl35) 340(M+H, Cl37)
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