反应详情

To a suspension of 4-aminophenylethylalcohol (7.27 g, 51.5 mmol) in conc. HCl (100 mL) was added dropwise a solution of sodium nitrate (3.9 g, 56 mmol) in water (100 mL) at −10° C. over 0.5 h. After stirring for 0.5 h, tin(II) chloride dihydrate (29 g, 128 mmol) in conc.HCl (100 mL) was added over 0.5 h and the resulting mixture was allowed to warm to room temperature. The mixture was stirred for 1 h and then added acetylacetone. The reaction mixture was warmed at 100° C. for 5 h. It was basified with aqueous NaOH (pH˜10). The mixture was extracted with dichloromethane, dried (Na2SO4), and evaporated to give the title compound quantitatively: MS (ESI) m/z 217 [M+H]+, 1H-NMR (CDCl3) δ 7.34-7.24 (4H, m), 5.98 (1H, s), 3.73 (2H, m), 2.84 (2H, m), 2.28 (3H, s), 2.27 (s, 3H).

1. stirringThe mixture was stirred for 1 h
2. temperatureThe reaction mixture was warmed at 100° C. for 5 h
3. extractionThe mixture was extracted with dichloromethane
4. dry with materialdried (Na2SO4)
5. customevaporated