Water → tert-butyl (4-fluoro-3-(2-(methylsulfinyl)-7-oxopyrido[2,3-d]pyrimidin-8(7H)-yl)phenyl)carbamate

関与物質

反応条件

反応手順

At 0° C., a suspension of tert-butyl (4-fluoro-3-(2-(methylthio)-7-oxopyrido[2,3-d]pyrimidin-8(7H)-yl)phenyl)carbamate (59) (270 mg, 0.67 mmol) in DCM (10 mL) was treated with MCPBA (77 wt. %, 161 mg, 0.72 mmol) in one portion and stirred at 0° C. for 1 h. The reaction mixture was diluted with DCM (50 mL), and treated with ice and water (30 mL) followed by 10% Na2CO3 (ca. 10 mL). The DCM layer was separated and the aqueous layer was extracted with an additional amount of DCM (2×50 mL), dried over Na2SO4 and concentrated to give crude tert-butyl (4-fluoro-3-(2-(methylsulfinyl)-7-oxopyrido[2,3-d]pyrimidin-8(7H)-yl)phenyl)carbamate (60) (369 mg) as a light yellow solid. m/z (ESI, +ve ion) 440.9 (M+Na)+. 1H NMR (400 MHz, DMSO-d6) δ ppm 9.63 (1H, br. s.), 8.24 (1H, d, J=9.6 Hz), 7.68 (1H, d, J=3.5 Hz), 7.44-7.52 (1H, m), 7.33-7.41 (1H, m), 6.95-7.01 (1H, m), 5.76 (1H, s), 2.72-2.78 (3H, m), 1.47 (9H, s). 19F NMR (376 MHz, DMSO-d6) δ ppm-129.58 (1F, s).

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