反应详情

温度

70 °C

19.4 mL (0.23 mmol) concentrated HCl and a solution of 16.1 g (0.23 mmol) sodium nitrite in water (approx. 70 mL) were added at 0° C. to a solution of 30 g (222 mmol) 2-ethyl-6-methyl-aniline in 135 mL EtOH and stirred for 15 min. This mixture was added at 45° C. to a solution of 10.5 mL of concentrated H2SO4 in 300 mL water and at the end of the addition heated to 70° C. The aqueous phase was cooled to RT and exhaustively extracted with EtOAc. The combined organic phases were extracted with 1 M NaOH solution. The aqueous phase was washed with DCM, acidified to pH 1 with 4 N HCl solution and extracted with DCM. The organic phase was washed with saturated NaCl solution, dried on Na2SO4 and concentrated by evaporation i.vac. The crude product was used in the subsequent reaction step without any further purification.

1. temperatureThe aqueous phase was cooled to RT
2. extractionexhaustively extracted with EtOAc
3. extractionThe combined organic phases were extracted with 1 M NaOH solution
4. washThe aqueous phase was washed with DCM
5. extractionextracted with DCM
6. washThe organic phase was washed with saturated NaCl solution
7. customdried on Na2SO4
8. concentrationconcentrated by evaporation i.vac
9. customThe crude product was used in the subsequent reaction step without any further purification