反应详情

To a solution of 5-(4,4-dimethyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)-1H-pyrrole-2-carbonitrile (1 eq, 71 mg, 0.27 mmol) in dimethylformamide (0.5 mL) was added potassium carbonate (5 eq, 0.18 g, 0.1.35 mmol). After 10 minutes, iodomethane (3 eq, 0.05 mL, 0.81 mmol) was added and the suspension was stirred for 2 h, poured into water (5 mL) and extracted with ethyl acetate (3×5 mL). The layers were separated, the aqueous layer was extracted with ethyl acetate (3×10 mL) and the combined organic layer was washed with brine, dried over MgSO4 and purified by flash column chromatography on silica gel eluting with 30% ethyl acetate/hexane to give 5-(4,4-dimethyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)-1-methyl-1H-pyrrole-2-carbonitrile (30 mg, 41%) as a white solid. 1H NMR (300 MHz, d6-DMSO): δ 1.64 (s, 6H), 3.71 (s, 3H), 6.33 (d, 1H, J=4.1 Hz), 6.98 (d, 1H, J=8.0 Hz), 7.03 (d, 1H, J=4.1 Hz), 7.39 (m, 2H), 10.39 (s, 1H). MS (APCI (−)) m/z 280 (M−H)−. Anal. calcd for C16H15N3O2, C, 68.3, H, 5.37; N, 14.9. Found, C, 68.4, H, 5.51; N, 14.6.

1. extractionextracted with ethyl acetate (3×5 mL)
2. customThe layers were separated
3. extractionthe aqueous layer was extracted with ethyl acetate (3×10 mL)
4. washthe combined organic layer was washed with brine
5. dry with materialdried over MgSO4
6. custompurified by flash column chromatography on silica gel eluting with 30% ethyl acetate/hexane