Reaction Steps
(3R)-4-(2-Chloro-6-(methylsulfinylmethyl)pyrimidin-4-yl)-3-methylmorpholine (1.75 g, 6.04 mmol) was dissolved in DMF (34.6 ml), to this was added slowly NaH (0.604 g, 15.10 mmol) and the reaction mixture was stirred for 5 minutes at RT. To the mixture was rapidly added methyl iodide (0.944 ml, 15.10 mmol) and the mixture was stirred for 1 hour. The reaction mixture was quenched with saturated NH4Cl solution (50 mL), extracted with DCM (3×50 mL) and the combined organic layers were passed through a phase separating column and then evaporated to afford a yellow gum. Water (50 mL) was added to the gum and the mixture extracted with EtOAc (3×50 mL). The combined organic layers were dried over MgSO4, filtered and then evaporated. The residue was purified by flash chromatography on silica, eluting with a gradient of 0 to 3% MeOH in DCM. Pure fractions were evaporated to afford (3R)-4-(2-chloro-6-(2-(methylsulfinyl)propan-2-yl)pyrimidin-4-yl)-3-methylmorpholine (1.693 g, 88%); 1H NMR (400 MHz, DMSO-d6) 1.19 (3H, d), 1.49 (6H, dd), 2.17 (3H, t), 3.19 (1H, dd), 3.37-3.48 (1H, m), 3.57 (1H, dd), 3.71 (1H, d), 3.92 (1H, d), 4.03 (1H, s), 4.41 (1H, s), 6.70 (1H, s); m/z: (ES+) MH+, 318.09 and 320.04. b) Iodobenzene diacetate (1.716 g, 5.33 mmol) was added to (3R)-4-(2-chloro-6-(2-(methylsulfinyl)propan-2-yl)pyrimidin-4-yl)-3-methylmorpholine (1.693 g, 5.33 mmol), magnesium oxide (0.859 g, 21.31 mmol), 2,2,2-trifluoroacetamide (1.204 g, 10.65 mmol) and rhodium(II) acetate dimer (0.059 g, 0.13 mmol) in DCM (100 mL). The resulting suspension was stirred at RT for 18 hours. The reaction mixture was filtered through Celite and then concentrated in vacuo onto silica (15 g). The resulting powder was purified by flash chromatography on silica, eluting with a gradient of 0 to 10% MeOH in DCM. Pure fractions were evaporated to afford N-[(2-{2-chloro-6-[(3R)-3-methylmorpholin-4-yl]pyrimidin-4-yl}propan-2-yl)(methyl)oxido-λ6-sulfanylidene]-2,2,2-trifluoroacetamide (0.700 g, 31%); 1H NMR (400 MHz, DMSO-d6) 1.20 (3H, dd), 1.83 (6H, d), 3.20 (1H, dd), 3.41 (1H, dddd), 3.56 (1H, d), 3.59 (3H, d), 3.72 (1H, d), 3.94 (1H, dd), 4.07 (1H, s), 4.45 (1H, s), 6.93 (1H, d); m/z: (ES+) MH+, 429.4 and 431.5.
