[F:1][C:2]1[CH:9]=[CH:8][CH:7]=[C:6]([S:10]([N:13]2[CH2:17][CH2:16][S:15][CH2:14]2)(=[O:12])=[O:11])[C:3]=1[C:4]#[N:5].I([O-])(=O)(=O)=[O:19].[Na+]>CO.O>[F:1][C:2]1[CH:9]=[CH:8][CH:7]=[C:6]([S:10]([N:13]2[CH2:17][CH2:16][S:15](=[O:19])[CH2:14]2)(=[O:12])=[O:11])[C:3]=1[C:4]#[N:5]54 mg of 2-Fluoro-6-(thiazolidine-3-sulfonyl)-benzonitrile in 10 ml of methanol and 1 ml of water are treated with 45 mg of sodium periodate, and the mixture is stirred for 14 hours at room temperature. The reaction mixture is poured into water, and the aqueous layer is extracted three times with ethyl acetate. The combined organic layers are dried over sodium sulfate, filtered and concentrated in vacuo. Purification by reverse phase HPLC affords 40 mg of 2-Fluoro-6-(1-oxo-1 lambda*4*-thiazolidine-3-sulfonyl)-benzonitrile.
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