[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([C:7]2[CH:8]=[C:9]3[C:14](=[N:15][CH:16]=2)[NH:13][CH2:12][CH2:11][CH2:10]3)[CH:2]=1.[C:17]([N:25]=C=O)(=[O:24])C1C=CC=CC=1.C([O-])([O-])=O.[K+].[K+].CCOC(C)=O>C(Cl)Cl>[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([C:7]2[CH:8]=[C:9]3[C:14](=[N:15][CH:16]=2)[N:13]([C:17]([NH2:25])=[O:24])[CH2:12][CH2:11][CH2:10]3)[CH:2]=16-Pyridin-3-yl-1,2,3,4-tetrahydro-[1,8]naphthyridine (50 mg, 0.24 mmol) and benzoyl isocyanate (58 mg, 0.36 mmol) are dissolved in 1.5 mL of DCM. The mixture is heated at 50° C. for 5 hrs. Then the solvent is removed in vacuum and the residue is dissolved in 1.5 mL of EtOH. K2CO3 (56 mg, 0.40 mmol) is added and the mixture is heated at 80° C. for 55 min. Then the solvent is removed and the residue is partitioned between water (35 mL) and EtOAc (55 mL). The aqueous layer is separated and extracted with EtOAc (2×30 mL). The organic layers are combined and concentrated to give the crude product. To the crude product is added EtOAc (1 mL) and the white solid formed is filtered, rinsed with EtOAc/heptane (1:1) mixture and dried to give 34 mg of the titled product.
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