反应详情

温度

-5 °C

A mixture of 100 grams (0.463 mole) of N,5 -dimethyl-3-phenyl-isoxazole-4-carboxamide and 1000 milliliters of dry tetrahydrofuran is cooled to -5° C. While maintaining the temperature at -5° to 0° C., there is added over a period of one hour a solution of 435 grams (0.95 mole) of 15% n-butyl-lithium in hexane. The resulting mixture is stirred for one hour and while maintaining the temperature at -5° to 0° C. a solution of 50 grams (0.485 mole) of benzonitrile in 100 milliliters of dry tetrahydrofuran is added over a period of one hour. The resulting mixture is stirred for an additional hour at which time 100 milliliters of saturated ammonium chloride is added dropwise over a period of 15 to 20 minutes. The resulting solution is then mixed for one hour and 40 minutes and then diluted with 200 milliliters of water. The solids are then filtered off and washed three times with tetrahydrofuran/hexane. The solids are then dried under vacuum to give 94 grams of 5-(2-amino-2-phenylethenyl)-N-methyl- 3-phenyl-isoxazole-4-carboxamide; m.p. 181° to 183° C. Further extraction from the mother liquors provide a total of 104 grams or 70.3% of the desired title compound. After further recrystallization from chloroform/methanol, the purified product has a melting point of 187° to 190° C.

1. temperatureWhile maintaining the temperature at -5° to 0° C.
2. additionis added over a period of one hour
3. additionis added dropwise over a period of 15 to 20 minutes
4. additionThe resulting solution is then mixed for one hour and 40 minutes
5. filtrationThe solids are then filtered off
6. washwashed three times with tetrahydrofuran/hexane
7. customThe solids are then dried under vacuum