反应详情

温度

23 °C

To a solution of (R)-5-(2-fluoro-5-nitro-phenyl)-2,2,5-trimethyl-1,1-dioxo-1,2,5,6-tetrahydro-1λ6-[1,4]thiazin-3-ylamine (950 mg, 2.88 mmol, Eq: 1.00) in ethanol (50 ml) was added at 23° C. under inert atmosphere triethylamine (292 mg, 402 μl, 2.88 mmol, Eq: 1.00) and after inertisation Pd/C 10% (307 mg, 288 μmol, Eq: 0.1). The suspension was set under hydrogen (balloon) and stirred at 23° C. for 1 hour. The catalyst was filtered off, washed three times with ethanol and a mixture of dichloromethane and methanol and evaporated the combined filtrate to give the crude and nearly pure (R)-5-(5-amino-2-fluoro-phenyl)-2,2,5-trimethyl-1,1-dioxo-1,2,5,6-tetrahydro-1λ6-[1,4]thiazin-3-ylamine (760 mg, 2.54 mmol, 88.0% yield) as an off-white solid. MS (ISP): m/z=300.3 [M+H]+.

1. filtrationThe catalyst was filtered off
2. washwashed three times with ethanol
3. additiona mixture of dichloromethane and methanol
4. customevaporated the combined filtrate