4-Bromo-2,5-difluoroaniline → 4-[6-(4-Bromo-2,5-difluoro-phenylamino)-5-methyl-pyrimidin-4-yloxy]-piperidine-1-carboxylic Acid Isopropyl Ester

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Reaction Conditions

Reaction Steps

A mixture of 4-(6-chloro-5-methyl-pyrimidin-4-yloxy)-piperidine-1-carboxylic acid isopropyl ester (1.03 g, 3.28 mmol), palladium acetate (74 mg, 0.33 mmol), biphenyl-3-yl-di-tert-butyl-phosphane (9.7 mg, 0.033 mmol), sodium tert-butoxide (708 mg, 7.36 mmol), and 4-bromo-2,5-difluoro-phenylamine (706 mg, 3.39 mmol) in 15 mL dioxane was heated in microwave for 1 hour at 120° C. Solids were filtered off and mixture was purified by column chromatography (hexane/AcOEt) and crystallized from hexane/AcOEt to give compound A86 as a tanned solid (652 mg, 41%). 1H NMR (CDCl3, 400 MHz) δ 1.04-1.05 (d, 6H), 1.50-1.61 (m, 2H), 1.74-1.82 (m, 2H), 1.89 (s, 3H), 3.16-3.22 (m, 2H), 3.51-3.60 (m, 2H), 4.69-4.76 (m, 1H), 5.09-5.15 (m, 1H), 6.34-6.36 (m, 1H), 7.07-7.11 (m, 1H), 8.15(s, 1H), 8.34-8.38(m, 1H). Exact mass calculated for C20H23BrF2N4O3 484.09, found 485.2 (MH+).

Provenance & Evidence