Diisopropylethylamine → HCID 68687725, compound

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 Example 76, Step C (0.300 g, 0.942 mmol) and N,N-diisopropylethylamine (0.26 mL, 1.508 mmol) in dry tetrahydrofuran (10 mL) was added trans-cinnamoyl chloride (0.235 g, 1.41 mmol) and the reaction mixture was stirred at room temperature under nitrogen for 21 hours. The reaction was then quenched by the addition of 2 M sodium hydroxide (5 mL) and the mixture partitioned between ethyl acetate (50 mL) and 2 M sodium hydroxide (50 mL). The organic phase was separated, 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 foam. Purification by flash chromatography using a solvent gradient of 1 to 4% methanol in dichloromethane gave a yellow syrup that was crystallized from diethyl ether/ethyl acetate/hexane to afford the title compound (0.360 g, 85%) as an off-white solid, m.p. 175° C.

Provenance & Evidence