[CH3:1][O:2][C:3](=[O:24])[CH2:4][CH:5]([C:12]1[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[C:14]([S:20](O)(=[O:22])=[O:21])[CH:13]=1)[C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1.O=P(Cl)(Cl)[Cl:27].N1C=CC=CC=1.O>CN1CCN(C)C1=O>[CH3:1][O:2][C:3](=[O:24])[CH2:4][CH:5]([C:12]1[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[C:14]([S:20]([Cl:27])(=[O:22])=[O:21])[CH:13]=1)[C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1To a solution of 3-(4-methoxy-3-sulfo-phenyl)-3-phenyl-propionic acid methyl ester (850 mg, 2.43 mmol) in 1,3-dimethyl-2-imidazolidinone (25 mL) is added POCl3 (0.57 ml, 6.06 mmol) and pyridine (0.33 mL, 4.13 mmol). The reaction mixture is stirred at RT for 1 h. After this time, water (50 mL) is added and the reaction mixture is extracted with DCM (3×50 mL). The combined organic phases are washed with brine (30 mL) then dried over MgSO4, filtered and concentrated in vacuo to afford the title compound as an oil.
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