[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[C:14]3[C:9](=[CH:10][N:11]=[CH:12][CH:13]=3)[C:8](=[O:15])[NH:7][C:6]=2[CH:16]=1.C(=O)([O-])[O:18][CH2:19][CH3:20].C([O-])([O-])=O.[K+].[K+].C1OCCOCCOCCOCCOCCOC1>CN(C=O)C.O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[C:14]3[C:9](=[CH:10][N:11]=[CH:12][CH:13]=3)[C:8](=[O:15])[N:7]([CH2:20][CH2:19][OH:18])[C:6]=2[CH:16]=1
To a stirred solution of 8-chlorobenzo[c][2,7]naphthyridin-5(6H)-one (80 mg, 0.347 mmol) in anhydrous DMF (5 mL) under a nitrogen atmosphere was added ethyl carbonate (122 mg, 1.387 mmol), K2CO3 (96 mg, 0.694 mmol), and 18-crown-6 (18.31 mg, 0.069 mmol). The reaction mixture was heated to 80° C. for 12 h. The reaction mixture was diluted with water (10 mL) and extracted with ethyl acetate (2×20 mL). The combined ethyl acetate layers were dried over sodium sulphate and concentrated under reduced pressure to afford 8-chloro-6-(2-hydroxyethyl)benzo[c][2,7]naphthyridin-5(6H)-one (80 mg, 0.291 mmol, 84% crude yield) The material was carried on without further purification. LC/MS (ESI) m/e 275.0 [(M+H)+, calcd for C14H12ClN2O2, 275.1]; 1H NMR (400 MHz, MeOD) δ 9.55 (s, 1H), 8.87 (d, J=5.6 Hz, 1H), 8.50 (d, J=8.8 Hz, 1H), 8.34 (d, J=5.6 Hz, 1H), 7.88 (d, J=1.6 Hz, 1H), 7.44 (dd, J=8.4, 2.0 Hz, 1H), 4.57 (t, J=6.0 Hz, 2H), 3.96 (t, J=6.0 Hz, 2H).
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