Dimethylformamide → (5,11-Dihydro-pyrido[2,3-b][1,5]benzodiazepin-10-yl)-[2-fluoro-4-(3-methyl-pyrazol-1-yl)-phenyl]-methanone

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Reaction Steps

To a solution of 6,11-dihydro-5H-pyrido[2,3-b][1,5]benzodiazepine of Example 1, Step B (3.0 g, 15.2 mmol) in dimethylformamide (35 mL) under nitrogen was added potassium carbonate (6.3 g, 45.6 mmol) followed by a solution of the crude 2,4difluorobenzoylchloride of Step A (22.8 mmol) in dimethylformamide (15 mL). After stirring at room temperature for 20 minutes, the reaction mixture was washed with water and stirred to give a solid which was collected by filtration. The solid was dissolved in chloroform and washed with 1 N sodium hydroxide and brine. The organic phase was dried over sodium sulfate and evaporated to dryness. The crude material was dissolved in dichloromethane and absorbed onto a silica Merck-60 flash column. Elution with 20% ethyl acetate in hexane provided the title compound (2.6 g, 51%) as a white foam which crystallized by sonication from hexane-ethanol, m.p. 161-163° C.

Provenance & Evidence