[CH3:1][C:2]1([CH3:15])[O:6][C@@H:5]([CH2:7][C:8]2([S:11]([O-])(=[O:13])=[O:12])[CH2:10][CH2:9]2)[CH2:4][O:3]1.[Na+].P(Cl)(Cl)([Cl:19])=O>>[CH3:1][C:2]1([CH3:15])[O:6][C@@H:5]([CH2:7][C:8]2([S:11]([Cl:19])(=[O:13])=[O:12])[CH2:10][CH2:9]2)[CH2:4][O:3]1A solution of sodium (S)-1-((2,2-dimethyl-1,3-dioxolan-4-yl)methyl)cyclopropane-1-sulfonate (1 eq) and phosphoryl trichloride (POCl3, 0.7 mL/mmol) is heated at 80° C. for 1 hour. The reaction mixture is cooled to room temperature, poured onto ice, stirred for 30 minutes and extracted with chloroform (2×). The combined organic extracts are dried (MgSO4) and concentrated under reduced pressure.
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