[N:1]1[O:2][N:3]=[C:4]2[C:8](=[O:9])[O:7][CH2:6][C:5]=12.CN(C)C(=O)C.[Cl:16][C:17]1[CH:18]=[C:19]([CH:21]=[CH:22][C:23]=1[F:24])[NH2:20]>CCO>[Cl:16][C:17]1[CH:18]=[C:19]([NH:20][C:8]([C:4]2[C:5]([CH2:6][OH:7])=[N:1][O:2][N:3]=2)=[O:9])[CH:21]=[CH:22][C:23]=1[F:24]4H,6H-Furo[3,4-c][1,2,5]oxadiazol-4-one (2.00 g, 0.0159 mol) was dissolved in EtOH (80 mL) and N,N-dimethylacetamide (10 mL) and then 3-chloro-4-fluoroaniline (2.5 g, 0.017 mol) was added as a solid. The reaction was heated at 80° C. overnight. The crude reaction mixture was concentrated in vacuo. The oil was extracted twice with EtOAc and washed with water. The organic was dried over Na2SO4 and concentrated. The crude residue was purified by flash column chromatography eluting with EtOAc:Hexane (1:1) to yield the desired product (3.2 g, 74%). 1H NMR (400 MHz, DMSO-d6) δ: 11.30 (s, 1H), 8.30 (dd, J=7.0, 2.7 Hz, 1H), 7.69 (ddd, J=9.1, 4.4, 2.6 Hz, 1H) 7.45 (dd, J=9.1, 9.1 Hz, 1H), 4.86 (d=5.8 Hz, 2H), 5.78 (t, 5.8 Hz, 1H); MF═C10H7ClFN3O3; LCMS calculated for C10H8ClFN3O3(M+H)+: m/z=272.024.
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