反应详情

温度

110 °C

7-Chloro-benzo[1,3]dioxine-2,4-dione (91) (0.090 g, 0.455 mmol) and benzene-1,3-diamine (397) (0.17 g, 1.57 mmol) were combined and dissolved in NMP (6 mL). The mixture was heated to 110° C. for 2 h. TLC was inconclusive, it was later determined that the desired product had same Rf as the aniline (397). LC-MS indicated complete reaction. The mixture was diluted with MeOH (2 mL) and LiOH (aqueous, 2.0 M, 4 mL). The mixture was stirred for 10 minutes. The solution was diluted with EtOAc (25 mL), washed with water (2×15 mL), saturated aqueous NaHCO3 (2×15 mL) and brine (2×15 mL) via extraction, dried over MgSO4 and concentrated to give a brown oil. Purification by flash chromatography on silica gel using a gradient of hexane and EtOAc (15–100% EtOAc in hexane) gave the desired product (398) as an off-white solid upon concentration (0.091 g, 0.347 mmol, 76% yield). LC-MS (ESI): (exact mass: 262.05) m/e=263.0 [M+1]+ (100%), 525.3 [2M+1]+ (10%).