Methyl iodide → (11-Methyl-5,11-dihydro-pyrido[2,3-b][1,5]benzodiazepin-6-yl)-[4-(3-methyl-pyrazol-1-yl)-2-trifluoromethyl-phenyl]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 (20 mL). Neat 3-methylpyrazole (0.13 mL, 1.61 mmol) was added dropwise at ambient temperature. Stirring was continued until the gas evolution subsided, and then the (5,11-dihydro-pyrido [2,3-b][1,5]benzodiazepin-6-yl)-(4-fluoro-2-trifluoromethyl-phenyl)methanone of Example 4, Step B (0.52 g, 1.34 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. After cooling, sodium hydride (60% suspension in oil, 0.080 g, 2.0 mmol, washed with hexane) and methyl iodide (0.25 mL, 4.0 mmol) were added. The reaction mixture was stirred for an additional 15 minutes, and then partitioned between water and ethyl acetate. The organic extracts were dried over sodium sulfate and evaporated to dryness. The residue was dissolved in dichloromethane and absorbed onto a silica Merck-60 flash column. Elution with 20% ethyl acetate in hexane provided the title product (0.28 g, 45.1%) as a foam which crystallized by sonication from ethanol-hexane as a white solid, m.p. 188-190° C.

Provenance & Evidence