Diisopropylethylamine → 2-(4-{[(4-Bromo-5-methyl-1H-pyrrol-2-yl)carbonyl]amino}piperidin-1-yl)-6-chloroisonicotinamide

Participants

Reaction Steps

4 N HCl/dioxane solution (10 ml) was added to tert-butyl 1-[4-(aminocarbonyl)-6-chloropyridin-2-yl]piperidin-4-ylcarbamate (Intermediate 16, 100 mg, 0.282 mmol). The mixture was stirred at room temperature for 90 minutes. The solvent was removed in vacuo and the anhydrous diethylether (25 ml) was added. The solvent was removed in vacuo and light brown solid that resulted was dried under vacuum for several hours. LCMS indicated a pure product 2-(4-aminopiperidin-1-yl)-6-chloroisonicotinamide hydrochloride salt (MS M+H:255). Pentafluorophenyl 4-bromo-5-methyl-1H-pyrrole-2-carboxylate (Intermediate 17) (104 mg, 0.282 mmol), and N,N-diisopropyl ethylamine (98 μl, 0.564 mmol) were added to 2-(4-aminopiperidin-1-yl)-6-chloroisonicotinamide hydrochloride salt (82 mg, 0.282 mmol) in anhydrous DMA (4 ml). The mixture was stirred at room temperature 18 h and was filtered and purified by semi-preparative HPLC using CH3CN/H2O (0.1% TFA) to give the title compound (28 mg).

Provenance & Evidence