反应详情

To a solution of 4.2 g 2-chloro-isonicotinoyl chloride in 25 ml. fluorobenzene there is added with cooling 11.7 g AlCl3. The mixture is heated at 70°-80° C. during 7 hrs. The crude is added to acidic (pH 1-2) cold water. The pH is raised until 4.5 with diluted aqueous NaOH. This aqueous organic mixture is extracted several times with methylene chloride. The combined extracts are washed with water, dried (Na2SO4) and distilled in a rotary evaporator. The remaining crude oil is purified through a silica column, eluting with ethyl ether:petroleum ether 1:3. Yield 5 g of the title product, m.p. 60°-3° C. (cyclohexane); UV (ethanol) λmax.: 262 nm, ε=10,250; Cl 15.30 (15.05); F 8.15 (8.06).

1. temperatureThe mixture is heated at 70°-80° C. during 7 hrs
2. extractionThis aqueous organic mixture is extracted several times with methylene chloride
3. washThe combined extracts are washed with water
4. dry with materialdried (Na2SO4)
5. distillationdistilled in a rotary evaporator
6. customThe remaining crude oil is purified through a silica column
7. washeluting with ethyl ether:petroleum ether 1:3