反应详情

A mixture of 300 mg (1.6 mmol) of 4-methylamino-2-methylthiopyrimidine-5-carboxaldehyde, 232 mg (1.8 mmol) of 2,6-difluoroaniline and 59 mg (0.3 mmol) of 4-toluenesulfonic acid monohydrate in 30 ml of toluene was heated at reflux with azeotropic removal of water for 18 hours. The mixture was cooled and evaporated. The residue was dissolved in 20 ml of tetrahydrofuran and added dropwise to a solution of 1.6 ml (1.6 mmol) of lithium aluminium hydride (1M in tetrahydrofuran) in a further 20 ml of tetrahydrofuran. After 30 minutes the mixture was cooled in ice and 0.5 ml of water, 0.75 ml of 2M sodium hydroxide solution and finally 1 ml of water were cautiously added dropwise. The resulting suspension was filtered through a filter aid and the filtrate was evaporated. The residue was subjected to column chromatography on silica gel using diethyl ether/hexane (1:1) for the elution to yield 210 mg (44%) of 5-(2,6-difluorophenyl)aminomethyl-4-methylamino-2-methylthiopyrimidine as a white solid. [Mass spectrum (ESI) MH+ =297].

1. temperaturewas heated
2. temperatureThe mixture was cooled
3. customevaporated
4. dissolutionThe residue was dissolved in 20 ml of tetrahydrofuran
5. temperatureAfter 30 minutes the mixture was cooled in ice
6. filtrationThe resulting suspension was filtered through a filter aid
7. customthe filtrate was evaporated
8. washfor the elution