[Na+].[CH2:2]([O:7][C:8]1[CH:13]=[CH:12][C:11]([S:14]([O-:17])(=O)=[O:15])=[CH:10][CH:9]=1)[CH:3]=[C:4]=[CH:5][CH3:6].P(Cl)(Cl)([Cl:20])=O.O>C(#N)C.S1(CCCC1)(=O)=O>[CH2:2]([O:7][C:8]1[CH:13]=[CH:12][C:11]([S:14]([Cl:20])(=[O:17])=[O:15])=[CH:10][CH:9]=1)[CH:3]=[C:4]=[CH:5][CH3:6]To a suspension of product from Example 9 (740 mg, 2.48 mmol) in acetonitrile (2 ml) and sulfolane (2 ml) was added phosphoryl chloride (0.9 ml, 9.93 mmol) and the resulting mixture was heated at 60-65° C. for 2 hours. The mixture was cooled in ice and cold water was added, dropwise, while stirring was continued for an additional 15 minutes. The reaction mixture was extracted with ethyl acetate and the organic layer was dried over anhydrous sodium sulfate. The crude residue was purified by flash chomatography to give 415 mg (65%) of the product.
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