S([O-])([O-])=O.[Na+].[Na+].C(=O)(O)[O-].[Na+].[F:12][C:13]1[CH:18]=[C:17]([F:19])[C:16]([F:20])=[CH:15][C:14]=1[S:21](Cl)(=[O:23])=[O:22].Br[CH:26]1[CH2:30][CH2:29][O:28][C:27]1=[O:31]>O>[F:12][C:13]1[CH:18]=[C:17]([F:19])[C:16]([F:20])=[CH:15][C:14]=1[S:21]([CH:26]1[CH2:30][CH2:29][O:28][C:27]1=[O:31])(=[O:23])=[O:22]A solution of sodium sulfite (153 mg, 1.21 mmol) and sodium bicarbonate (306 mg, 3.63 mmol) in water (3 mL) was treated with 2,4,5-trifluorobenzenesulfonyl chloride (280 mg, 1.21 mmol) and heated in a microwave reactor at 150° C. for 400 seconds. The resulting mixture was treated with 3-bromodihydrofuran-2(3H)-one (299 mg, 1.82 mmol) and then heated in a microwave reactor at 150° C. for 500 seconds. The mixture was cooled to 10° C. and the resulting solid filtered off and dried in vacuo to give the title compound (60 mg).
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