Diisopropylethylamine → 4-[[10,11-Dihydro-10-[[2-methyl-2'-trifluoromethyl[1,1'-biphenyl]-4-yl]carbonyl]-5H-pyrrolo[2,1-c][1,4]benzodiazepin-3-yl]carbonyl]-1-piperazine-carboxylic acid, tert-butyl ester

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Reaction Steps

10-[(2-Methyl-2′-trifluoromethyl-[1,1′-biphenyl]-4-yl)carbonyl]-10,11-dihydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine-3-carboxylic acid of Example 1, Step F (1.0 g, 2.04 mmol), 1-(tert-butoxycarbonyl)piperazine (0.46 g, 2.47 mmol) and 1-hydroxybenzotriazole monohydrate (0.30 g, 2.22 mmol) were dissolved in N,N-dimethylformamide (8 mL). 1-[3-(dimethylamino)propyl]-3-ethyl carbodiimide hydrochloride (0.43 g, 2.24 mmol) was then added followed by N,N-diisopropylethyl amine (0.55 mL, 3.09 mmol). The reaction mixture was stirred overnight, diluted with ethyl acetate and washed with water and saturated aqueous sodium bicarbonate. The organic phase was then dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give a brown oil. Purification by flash chromatography using a solvent gradient from 30% to 50% ethyl acetate in hexane provided the desired title compound, which was redissolved in dichloromethane and evaporated to dryness in vacuo to a white foam (1.1 g).

Provenance & Evidence