[F:1][C:2]1[CH:8]=[CH:7][C:5]([NH2:6])=[CH:4][CH:3]=1.[O:9]=[C:10]1[C:15]([C:16]([O:18][CH3:19])=[O:17])=[CH:14][CH:13]=[CH:12]O1.Cl.CN(C)CCCN=C=NCC.O>CN(C=O)C.CN(C1C=CN=CC=1)C>[F:1][C:2]1[CH:8]=[CH:7][C:5]([N:6]2[CH:12]=[CH:13][CH:14]=[C:15]([C:16]([O:18][CH3:19])=[O:17])[C:10]2=[O:9])=[CH:4][CH:3]=1
To a solution of 4-fluoroaniline (6.5 g, 58.4 mmol) in DMF (30 mL) at ice bath temperature was added methyl 2-oxo-2H-pyran-3-carboxylate (9.0 g, 58.4 mmol). The resulting mixture was stirred for 15 min cold and was then warmed to ambient temp for 3 hours. N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDCI—HCl) (13.5 g, 70.0 mmol) and DMAP (1.43 g, 11.7 mmol) were added and the resulting mixture was stirred at ambient temp overnight. The reaction mixture was poured into water (300 mL), extracted with ethyl acetate (3×100 mL), washed with brine, dried over anhydrous Na2SO4 and concentrated in vacuo to obtain methyl 1-(4-fluorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxylate. This crude product was used for the next step without further purification.
Wird geladen…
