Cesium carbonate → N-(2,5-difluoro-4-((2-pivalamidopyridin-4-yl)oxy)phenyl)-N'-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide

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Reaction Conditions

Reaction Steps

N-(4-(2-chloropyridin-4-yloxy)-2,5-difluorophenyl)-N′-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide (160 mg, 0.34 mmol) (as prepared in Example 1), 2,2-dimethyl-propionamide (100 mg, 1 mmol), xantphos (40 mg, 0.068 mmol), and cesium carbonate (222 mg, 0.68 mmol) were dissolved in dry dioxane (2 mL) and argon was bubbled through the mixture for 10 minutes. Pd(OAc)2 (8 mg, 0.034 mmol) was then added, and the solution was degassed for an additional 10 minutes. The mixture was heated to 100° C. and stirred overnight. The reaction mixture was cooled to RT and diluted with EtOAc (20 mL) and water (15 mL). The organic layer was separated and washed with brine. The aqueous layer was extracted with EtOAc and the extracts were washed with brine. The combined organic layers were dried over sodium sulfate and concentrated in vacuo. The residue was purified by prep-TLC to give N-(2,5-difluoro-4-((2-pivalamidopyridin-4-yl)oxy)phenyl)-N′-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide (72 mg, 40% yield). 1H-NMR (400 MHz, DMSO-d6): δ 8.19-8.17 (m, 2H), 7.69 (s, 1H), 7.53-7.51 (m, 2H), 7.24 (br t, J=7.2 Hz, 1H), 7.10-7.05 (m, 2H), 6.73 (brs, 1H), 1.73-1.69 (m, 4H), 1.27 (s, 9H); MS (ESI); m/z 527.3 [M+H]+.

Provenance & Evidence