[CH2:1]([N:4]1[C:10]2[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=2[C:8](=[O:15])[NH:7][C:6]2[CH:16]=[CH:17][CH:18]=[N:19][C:5]1=2)[C:2]#[CH:3].[CH2:20]=O.[NH:22]1[CH2:26][CH2:25][CH2:24][CH2:23]1.C>[Cu]Cl.O1CCOCC1>[N:22]1([CH2:20][C:3]#[C:2][CH2:1][N:4]2[C:10]3[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=3[C:8](=[O:15])[NH:7][C:6]3[CH:16]=[CH:17][CH:18]=[N:19][C:5]2=3)[CH2:26][CH2:25][CH2:24][CH2:23]1The mixture of 8.5 g (0.034 mol) of 5,11-dihydro-11-(prop-2-ynyl)-6H-pyrido[2,3-b][1,4]benzodiazepin-6-one, 50 ml of anhydrous dioxan, 1.08 g (0.036 mol) of paraformaldehyde, 2.77 g (0.039 mol) of pyrrolidine and 0.2 g of copper (I) chloride was refluxed for 1 hour with stirring and then, after cooling, evaporated down in a water jet vacuum. The residue was partitioned between water and ethylacetate, the ethylacetate solution obtained was mixed with 2 g of animal charcoal, dried over sodium sulphate, filtered and evaporated down. The residue was purified by column chromatography on silica gel using first ethyl acetate and then dichloromethane/cyclohexane/methanol/conc. ammonia 68/15/15/2 (v/v/v/v) as eluant. The crude product obtained after evaporation of the suitable eluates was recrystallised once more from ethylacetate. Yield: 1.6 g (14% of theory) of colourless crystals, m.p. 153° C.; RF 0.5 (Merck, ready-made TLC plates, silica gel 60 F-254; eluant: dichloromethane/cyclohexane/methanol/conc. ammonia 68/15/15/2 v/v/v/v).
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