2-(4-Amino-3-chloro-5-trifluoromethyl-benzyl)-4-oxo-4-[4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidin-1-yl]-butyraldehyde → 3-(1-{4-(4-Amino-3-chloro-5-trifluoromethyl-phenyl)-3-[1-(3-dimethylamino-2,2-dimethyl-propyl)-1h-benzimidazol-2-yl]-butyryl}-piperidin-4-yl)-1,3,4,5-tetrahydro-1,3-benzodiazepin-2-one

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Reaction Steps

To a solution of 320 mg (0.596 mmol) 2-(4-amino-3-chloro-5-trifluoromethyl-benzyl)-4-oxo-4-[4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidin-1-yl]-butyraldehyde (Intermediate product 36) in 7 mL DMF was added 230 mg (0.695 mmol) N-(3-dimethylamino-2,2-dimethyl-propyl)-benzene-1,2-diamine-trihydrochloride (Intermediate product 37) and the mixture was stirred for 16 hours in an atmosphere of air. The reaction mixture was evaporated down i. vac. and the residue combined with EtOAc. The org. phase was washed with sat. aqueous sodium bicarbonate solution, dried over sodium sulphate and evaporated i. vac. The crude product was purified by column chromatography (silica gel, gradient dichloromethane/MeOH 20/1→10/1 v/v) then (Alox, neutral, activity II-III, gradient EtOAc/MeOH 100/0→40/1) and HPLC-MS (Zorbax Bonus C18 amide-phase 5 μm, gradient 0.15% formic acid in water/acetonitrile 10/90→90/10 v/v).

Provenance & Evidence