Sodium hydride → [4-(3-tert-Butyl-1H-pyrazol-1-yl)-2-(trifluoromethyl)-phenyl]-(6,11-dihydro-5H-pyrido[2,3-b][1,5]benzodiazepin-6-yl)-methanone

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Reaction Steps

Sodium hydride (60% suspension in oil, 0.12 g, 3.0 mmol) was washed with hexane, dried under nitrogen and resuspended in dry dimethylformamide (10 mL). 3-tert-butylpyrazole (0.20 g, 1.6 mmol) was added in one portion at ambient temperature, and the stirring was continued until the gas evolution subsided. The (6,11-dihydro-5H-pyrido[2,3-b][1,5]benzodiazepin-6-yl)-[4-fluoro-2-trifluoromethyl-phenyl]-methanone of Example 4, Step B (0.50 g, 1.3 mmol) was added in one portion to the clear solution. The mixture was placed in an oil bath (preheated at 130° C.) for 30 minutes and then heated at reflux for 5 hours. After cooling, the mixture was partitioned between water and ethyl acetate. The organic extracts were dried over sodium sulfate and evaporated to dryness. The crude residue was dissolved in dichloromethane and absorbed onto a silica Merck-60 flash column. Elution with 25% ethyl acetate in hexane provided the title product (0.23 g) as a foam which crystallized by trituration with hexane-ether, m.p. 136-140° C.

Provenance & Evidence