反应详情

温度

0 °C

92 ml (92 mMol) o-Tolylmagnesium chloride solution (1M in THF) were added over 15 minutes to a solution of 5.0 g (23 mMol) N-tert.-butyl-6-chloro-nicotinamide in 25 ml THF cooled to 0° C. The reaction mixture was stirred 18 hours at 30° C. and cooled again to 0° C. 5.6 ml (138 mMol) Methanol were added over 30 minutes, stirring was pursued for 10 minutes and 6.3 g (27 mMol) 2,3-dichloro-5,6-dicyano-1,4-benzoquinone were added. After 1 hour at room temperature, the reaction mixture was concentrated to 50 g under reduced pressure, heated to 50° C. and 100 ml tert.-butyl-methylether were added. The resulting suspension was refluxed for 30 minutes, cooled to room temperature and, after 1 hour, filtered off. The filtrate was concentrated and dried under high vacuum to yield 6.3 g (90%) of N-tert.-butyl-6-chloro-4-o-tolyl-nicotinamide as an orange foam.

1. temperaturecooled again to 0° C
2. stirringstirring
3. waitwas pursued for 10 minutes
4. waitAfter 1 hour at room temperature
5. concentrationthe reaction mixture was concentrated to 50 g under reduced pressure
6. temperatureheated to 50° C.
7. addition100 ml tert.-butyl-methylether were added
8. temperatureThe resulting suspension was refluxed for 30 minutes
9. temperaturecooled to room temperature and, after 1 hour
10. filtrationfiltered off
11. concentrationThe filtrate was concentrated
12. customdried under high vacuum