[Cl:1][C:2]1[C:7]([NH:8][NH2:9])=[N:6][CH:5]=[CH:4][N:3]=1.CO[C:12](OC)(OC)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>>[Cl:1][C:2]1[C:7]2[N:6]([C:12]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)=[N:9][N:8]=2)[CH:5]=[CH:4][N:3]=1Title compound 471 (0.8 g, 5.53 mmol) and Trimethyl orthobenzoate (5 mL, 29.1 mmol) were combined and the reaction mixture was stirred at 120° C. for 3 h. The mixture was cooled to room temperature and the solid was filtered and washed with hexanes to afford title compound 472 (1.35 g, 100%) as a beige solid. MS (m/z): 231.1 (M+H)
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