P12(SP3(SP(SP(S3)(S1)=S)(=S)S2)=S)=[S:2].C(=O)([O-])[O-].[Na+].[Na+].[F:21][C:22]1[CH:27]=[CH:26][C:25]([CH:28]2[NH:33][C:32](=O)[CH2:31][S:30][CH2:29]2)=[CH:24][CH:23]=1>C1COCC1>[F:21][C:22]1[CH:27]=[CH:26][C:25]([CH:28]2[NH:33][C:32](=[S:2])[CH2:31][S:30][CH2:29]2)=[CH:24][CH:23]=1A mixture of phosphorus pentasulfide (5.12 g, 11.5 mmol) and sodium carbonate (1.22 g, 11.5 mmol) in THF (30 mL) was stirred at room temperature. A solution of 5-(4-fluoro-phenyl)-thiomorpholin-3-one (2.0 g, 9.5 mmol) in THF (25 mL) was slowly added, and the mixture was stirred at room temperature for 90 minutes. The mixture was diluted with 10% aqueous Na3PO4 solution (40 mL), and stirred at room temperature for five minutes. The mixture was extracted with a 1:4 mixture of ethyl acetate and diethyl ether, and the organic phase was separated, dried over MgSO4, filtered and concentrated under reduced pressure. Elution of the residue through silica (15-20% ethyl acetate/hexanes) gave 1.36 g of 5-(4-fluoro-phenyl)-thiomorpholine-3-thione, MP=107-108° C.
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