反应详情

8-Fluoro-1H-benzo[d][1,3]oxazine-2,4-dione (3.00 g, 16.6 mmol) was dissolved in tetrahydrofuran (100 mL, 1.23 mol) and prop-2-ynylamine (1.70 mL, 24.8 mmol) was added. The reaction was stirred for 2 hours and then concentrated under reduced pressure onto silica gel. Purification by silica gel chromatography (dry loaded) using a gradient of 0-60% EtOAc/hex as the eluting solvent to obtain 2-amino-3-fluoro-N-prop-2-ynyl-benzamide as a white solid (2.52 g, 79%). m.p.=89-91° C.; LCMS (m/e) 138 (M-NHCH2CCH); 1H-NMR (CDCl3, 400 MHz) δ 7.14 (d, 1H, J=8.0 Hz), 7.12-7.05 (m, 1H), 6.64-6.56 (m, 1H), 6.28-6.14 (m, 1H), 5.67 (bs, 2H), 4.27-4.19 (m, 2H), 2.34-2.27 (m, 1H).

1. concentrationconcentrated under reduced pressure onto silica gel
2. customPurification
3. customby silica gel chromatography (dry loaded)