反应详情

A suspension of 7-nitro-2H-benzo[b][1,4]oxazin-3(4H)-one (0.5 g, 2.575 mmol), 2-(2-chloroethyl)-1-methylpyrrolidine hydrochloride (0.94 g, 5.150 mmol), NaI (0.19 g, 1.287 mmol), and K2CO3 (2.13 g, 15.452 mmol) in dry DMF (10 mL) was stirred at room temperature overnight (18 hours). The reaction was diluted with water (150 mL), and the product was extracted into ethyl acetate (2×25 mL). The combined ethyl acetate layers were washed with brine (20 mL) and dried (Na2SO4). The solvent was evaporated, and the crude material was purified by column chromatography (3:97 (2M NH3 in MeOH):CH2Cl2) to obtain the title compound (0.525 g, 67%) as a yellow solid. 1H NMR (DMSO-d6) δ 1.47-1.65 (m, 4H), 1.79-2.13 (m, 4H), 2.18 (s, 3H), 2.89-2.95 (m, 1H), 3.98 (t, 2H, J=7.8 Hz), 4.79 (s, 2H), 7.40 (d, 1H, J=9.0 Hz), 7.80 (d, 1H, J=2.7 Hz), 7.98 (dd, 1H, J=2.4, 9.0 Hz); ESI-MS (m/z, %): 306 (MH+, 100).

1. extractionthe product was extracted into ethyl acetate (2×25 mL)
2. washThe combined ethyl acetate layers were washed with brine (20 mL)
3. dry with materialdried (Na2SO4)
4. customThe solvent was evaporated
5. customthe crude material was purified by column chromatography (3:97 (2M NH3 in MeOH):CH2Cl2)