2,8,9-Triisobutyl-2,5,8,9-tetraaza-1-phosphabicyclo(3.3.3)undecane → Isopropyl 4-((5-methoxy-6-((2-methyl-6-(methylsulfonyl)pyridin-3-yl)amino)pyrimidin-4-yl)oxy)piperidine-1-carboxylate

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A mixture of 4-(6-chloro-5-methoxy-pyrimidin-4-yloxy)-piperidine-1-carboxylic acid isopropyl ester (14.7 g, 44.6 mmol), 2-methyl-6-(methylsulfonyl)pyridin-3-amine (8.20 g, 44.0 mmol), palladium acetate (0.50 g, 2.23 mmol), 2,8,9-triisobutyl-2,5,8,9-tetraaza-1-phospha-bicyclo[3.3.3]undecane (1.65 ml, 4.64 mmol), and sodium 2-methylpropan-2-olate (6.50 g, 67.6 mmol) in dioxane (300 mL) were stirred at 90° C. for 1 h and then at 60° C. overnight. The reaction mixture was cooled and filtered. The solid was washed with ethyl acetate. The filtrate was concentrated and the residue was purified by silica gel column chromatography using hexane/ethyl acetate (1:2). The fractions containing only the product were collected, and concentrated to give the title compound (4.6 g, 22%) that was crystallized from ethyl acetate/hexane as a white solid. The fractions containing the product contaminated with impurities were concentrated and the residue was further purified by recrystallization from ethanol to give the title compound (2.5 g, 12%) as a white solid. The two combined to give 7.1 g of the title compound in 34% yield. Exact mass calculated for C21H29N5O6S: 479.2. Found: LCMS m/z=480.4 (M+H+); 1H NMR (400 MHz, CDCl3) δ 1.27 (d, J=6.3 Hz, 6H), 1.80-1.85 (m, 2H), 2.02-2.07 (m, 2H), 2.66 (s, 3H), 3.19 (s, 3H), 3.38-3.45 (m, 2H), 3.78-3.83 (m, 2H), 4.01 (s, 3H), 4.91-4.97 (m, 1H), 5.38-5.42 (m, 1H), 7.30 (s, 1H), 7.97 (d, J=8.6 Hz, 1H), 8.20 (s, 1H), 9.01-9.04 (d, J=8.6 Hz, 1H).

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