反应详情

To a solution of 2-amino-1-ethylbenzene (5 ml, 5.0 g, 41 mmol) in pyridine (3.5 ml) and dichloromethane (10 ml), methanesulfonyl chloride (3.2 ml. 4.7 g, 41 mmol) was added dropwise over 10 min at 0° C. The reaction mixture was stirred at rt for 1 hour. After cooling to 0° C., aluminum trichloride (13.8 g, 103 mmol) was added to the reaction mixture carefully. Then propionyl chloride (3.6 ml, 3.8 g, 41 mmol) was added dropwise over 15 min. The reaction mixture was diluted with toluene (25 ml) and poured into 2 M hydrogen chloride aquoues solution (50 ml) under stirring at 0° C. The precipitate solids were filtered, washed with water and dried in vacuo to get a desired product (4.5 g, 43% yield) as yellow solids.

1. temperatureAfter cooling to 0° C.
2. stirringunder stirring at 0° C
3. filtrationThe precipitate solids were filtered
4. washwashed with water
5. customdried in vacuo