[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][C:10]=1[F:11])[NH:7][CH:6]=[C:5]2[I:12].[H-].[Na+].[C:15]1([S:21](Cl)(=[O:23])=[O:22])[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1>C1COCC1>[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][C:10]=1[F:11])[N:7]([S:21]([C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)(=[O:23])=[O:22])[CH:6]=[C:5]2[I:12]To a solution of 5,6-difluoro-3-iodo-1H-indole (Intermediate 27; 930 mg; 3.33 mmol) in THF (20 mL) at 0° C. was added NaH (266.4 mg; 60%; 6.66 mmol) under nitrogen. The reaction mixture was stirred at r.t. for 15 minutes before a solution of benzenesulfonyl chloride (763.4 mg; 4.32 mmol) in THF (2 mL) was added dropwise. The reaction was stirred at r.t. for 12 hours, quenched with an ice-water mixture (60 mL) and extracted with EtOAc (30 mL×3). The combined organic layers were washed with brine (100 mL), dried over anhydrous Na2SO4, filtered, concentrated, and purified by a silica gel chromatography (petroleum ether/EtOAc=10/1-3/1) to afford 1.01 g (72%) of the title compound as a yellow solid.
Wird geladen…
