Benzoyl chloride → 10-Benzoyl-N-(pyridin-3-ylmethyl)-10,11-dihydro-5H-pyrrolo[2,1-C][1,4]benzodiazepine-3-carboxamide

Participants

Reaction Steps

To a suspension of N-(pyridin-3-ylmethyl)-10,11-dihydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine-3-carboxamide of Step C (300 mg, 0.942 mmol) in dry tetrahydrofuran (15 mL) at room temperature under nitrogen was added N,N-diisopropylethylamine (0.26 mL, 1.508 mmol) followed by benzoyl chloride (0.165 mL, 1.41 mmol) and the reaction mixture stirred at room temperature for 21 hours. The reaction was quenched by the addition of 2 M sodium hydroxide (5 mL) and then the mixture partitioned between ethyl acetate (50 mL) and 2 M sodium hydroxide (50 mL). The organic phase was washed with 2 M sodium hydroxide (50 mL), water (50 mL) and brine (50 mL), dried over anhydrous magnesium sulfate and concentrated in vacuo to afford a yellow syrup. Purification by flash chromatography using a solvent gradient of 0 to 4% methanol in dichloromethane gave a white foam that was crystallized from diethyl ether/hexane to give the title compound (0.319 g, 80%) as a white crystalline solid, m.p. 197° C.

Provenance & Evidence