反应详情

温度

0 °C

7.0 ml (14.1 mMol) iso-Propylmagnesium chloride solution (2M in THF) were added over 5 minutes to a solution of 1.0 g (4.7 mMol) N-tert.-butyl-6-chloro-nicotinamide in 5.0 ml THF cooled to 0° C. and the reaction mixture was stirred 18 hours at room temperature. After cooling to 0° C., 1.14 ml (28.2 mMol) methanol were added over 10 minutes, followed, after 15 minutes, by 1.17 g (5.2 mMol) 2,3-dichloro-5,6-dicyano-1,4-benzoquinone. After stirring 30 minutes at room temperature, the red-brown solution was concentrated under reduced pressure to about 10 g, heated to 50° C. and 20 ml tert.-butyl-methylether were added. The resulting suspension was stirred 1 hour at 55° C., then 1 hour at room temperature and filtered. The filtrate was concentrated under reduced pressure and digested in 9 ml n-hexane/ethyl acetate 4:1 to yield 0.67 g (56%) N-tert.-butyl-6-chloro-4-(prop-2-yl)-nicotinamide as a beige powder of m.p.=130-140° C. (dec.)

1. temperatureAfter cooling to 0° C.
2. stirringAfter stirring 30 minutes at room temperature
3. concentrationthe red-brown solution was concentrated under reduced pressure to about 10 g
4. temperatureheated to 50° C.
5. addition20 ml tert.-butyl-methylether were added
6. stirringThe resulting suspension was stirred 1 hour at 55° C.
7. filtration1 hour at room temperature and filtered
8. concentrationThe filtrate was concentrated under reduced pressure