反应详情

温度

100 °C

A suspension of 7-nitro-2H-benzo[b][1,4]oxazin-3(4H)-one (0.5 g, 2.575 mmol), 1-(2-chloroethyl)pyrrolidine hydrochloride (0.43 g, 2.575 mmol) and K2CO3 (1.06 g, 7.726 mmol) in dry DMF (5 mL) was stirred at 100° C. overnight (18 hours). The reaction was brought to room temperature, diluted with water (100 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 (0.49 g, 65%) as a solid. 1H NMR (DMSO-d6) δ 1.62-1.70 (m, 4H), 2.46-2.54 (m, 4H, merged with DMSO-d6 resonance), 2.60 (t, 2H, J=6.9 Hz), 4.08 (t, 2H, J=6.9 Hz), 4.80 (s, 2H), 7.44 (d, 1H, J=9.3 Hz), 7.80 (d, 1H, J=2.4 Hz), 7.96 (dd, 1H, J=2.7, 9.0 Hz); ESI-MS (m/z, %): 292 (MH+, 100).

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