Diisopropylethylamine → N-(2-(tert-butylamino)pyridin-3-yl)-2,3-difluorobenzamide

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To a solution of N2-tert-butylpyridine-2,3-diamine in dry DCM (150 mL) was added DIEA (17 mL, 95.5 mmol). The solution was cooled to 0° C. and carefully added 2,3-difluorobenzoyl chloride (8.35 g, 47.30 mmol). The reaction was allowed to warm up to RT and stirred for 1 hr. The mixture was then washed with water, saturated NaHCO3, and dried over MgSO4. Removal of the solvent by evaporation, the residue was purified by silica gel chromatography (5%-60% EtOAc/hexane) to yield N-(2-(tert-butylamino)pyridin-3-yl)-2,3-difluorobenzamide (4.0 g, 13.10 mmol); LC-MS m/e=306.1 (M+H).

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