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To a stirred solution of 4-(1-(7-fluoro-3-methyl-2-(4-methylpyridin-2-yl)quinolin-4-yl)-2,3-dihydro-1H-pyrido[2,3-b][1,4]thiazin-7-yl)morpholine (45 mg, 0.09 mmol) in EtOAc (2.5 mL) was added disodium tungstate (30.4 mg, 0.092 mol) and water (0.5 mL). The reaction was cooled at 0° C. and then H2O2 (56.6 μL, 1.85 mmol, 30%) was added. The reaction was allowed to warm to rt for 1 h. After this time more disodium tungstate (10 mg) was added followed by H2O2 (0.5 mL, 30%) and the reaction was stirred at rt overnight. After this time the reaction was diluted with EtOAc (50 mL) and treated with a saturated aqueous solution of NaHSO3 (15 mL). The separated organic layer was washed with brine (15 mL), dried over MgSO4, filtered and evaporated in vacuo to give 1-(7-fluoro-3-methyl-2-(4-methyl-2-pyridinyl)-4-quinolinyl)-7-(4-morpholinyl)-2,3-dihydro-1H-pyrido[2,3-b][1,4]thiazine 4,4-dioxide. 1H NMR (400 MHz, chloroform-d) δ ppm 8.59 (1H, d, J=4.7 Hz), 7.86-7.91 (2H, m), 7.70-7.77 (2H, m), 7.38 (1H, ddd, J=9.2, 8.0, 2.5 Hz), 7.25 (1H, dd, J=5.0, 0.9 Hz), 5.58 (1H, d, J=2.5 Hz), 4.18-4.27 (2H, m), 3.59-3.75 (6H, m), 2.84-3.02 (4H, m), 2.51 (3H, s), 2.44 (3H, s). Mass Spectrum (ESI) m/e=520.0 (M+1).

1. temperatureto warm to rt for 1 h
2. washThe separated organic layer was washed with brine (15 mL)
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. customevaporated in vacuo