Dichloromethane → Tert-butyl cis-2-(6-chloro-5-cyano-3-fluoropyridin-2-ylamino)cyclohexylcarbamate

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Reaction Steps

Trichloroacetyl chloride (0.55 ml) was added dropwise to a dichloromethane (17 ml) suspension containing tert-butyl cis-2-(5-aminocarbonyl-6-chloro-3-fluoropyridin-2-ylamino)cyclohexylcarbamate (1.74 g) and triethylamine (1.38 ml) under ice cooling, followed by stirring at room temperature for 1 hour. The solvent was distilled away under reduced pressure, and a saturated aqueous ammonium chloride solution and ethyl acetate were added. The organic layer was collected, washed with saturated saline, and dried over anhydrous magnesium sulfate, and then the solvent was distilled away under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane:ethyl acetate=10:0 to 3:1), diisopropylether was added, solid matter was collected by filtration, and a white solid of tert-butyl cis-2-(6-chloro-5-cyano-3-fluoropyridin-2-ylamino)cyclohexylcarbamate (1.26 g) was thus obtained.

Provenance & Evidence