P(Cl)(Cl)(Cl)=O.[Br:6][C:7]1[N:8]([C:12]2[CH:19]=[CH:18][C:15]([C:16]#[N:17])=[CH:14][C:13]=2[CH3:20])[CH:9]=[CH:10][CH:11]=1.[C:21](=O)([O-])[O-:22].[Na+].[Na+]>CN(C=O)C>[Br:6][C:7]1[N:8]([C:12]2[CH:19]=[CH:18][C:15]([C:16]#[N:17])=[CH:14][C:13]=2[CH3:20])[C:9]([CH:21]=[O:22])=[CH:10][CH:11]=1DMF (0.1 mL) was added to phosphorus oxychloride (0.5 mL, 5.2 mmol) at 0° C., and the mixture was stirred at room temperature for 1.5 h. At 0° C., a solution of compound 50B (100 mg. 0.36 mmol) in DMF (2 mL) was added, and the resultant mixture was stirred at room temperature for 30 min. The reaction mixture was poured into ice-water, adjusted to pH=8 with saturated aqueous sodium carbonate solution, and extracted with ethyl acetate (10 mL×3). The combined organic layers were washed with brine (20 mL×2), dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by preparative TLC to afford 50C (60 mg, yield 58%).
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