反应详情

A solution of 31.5 g (120 mMol) dimethyl 4-(2-fluorophenyl)-1,4-dihydro-2,6-dimethylpyridine-3,5-dicarboxylate in 260 ml dimethylformamide is added dropwise, under an atmosphere of nitrogen, to a suspension of 3.8 g (130 mMol) sodium hydride (80% in paraffin oil) in 60 ml dry dimethylformamide. Upon slowing down of the evolution of gas, the reaction mixture is further stirred for ten minutes at ambient temperature and subsequently 10.0 g (120 mMol) s-triazine in 260 ml dimethylformamide are added dropwise thereto. The reaction mixture is heated to 110° C. for 16 hours and, after cooling, evaporated in a vacuum. The dark residue is stirred with 600 ml acetone, filtered and the filtrate evaporated in a vacuum. The crude product is boiled with 300 ml methanol, the crystals formed after cooling are filtered off and, for further purification, are recrystallized from methanol. There is obtained methyl (±)-4-(2-fluorophenyl)-1,4,5,6-tetrahydro-2-methyl-5-oxo-1,6-naphthyridine-3-carboxylate in the form of pale beige crystals; m.p. 315°-316° C. (decomp.).

1. temperatureThe reaction mixture is heated to 110° C. for 16 hours
2. temperatureafter cooling
3. customevaporated in a vacuum
4. stirringThe dark residue is stirred with 600 ml acetone
5. filtrationfiltered
6. customthe filtrate evaporated in a vacuum
7. customthe crystals formed
8. temperatureafter cooling
9. filtrationare filtered off and, for further purification
10. customare recrystallized from methanol