[Cl:1][C:2](Cl)([P:10]([O:15][CH2:16][CH3:17])([O:12][CH2:13][CH3:14])=[O:11])[C:3]([O:5][C:6]([CH3:9])([CH3:8])[CH3:7])=[O:4].S([O-])([O-])=O.[Na+].[Na+]>C(O)C.O>[Cl:1][CH:2]([P:10]([O:15][CH2:16][CH3:17])([O:12][CH2:13][CH3:14])=[O:11])[C:3]([O:5][C:6]([CH3:9])([CH3:8])[CH3:7])=[O:4]The title compound of Step B (18.4 g, 0.0572 mol) was dissolved in ethanol (140 mL) and cooled to 0° C. A solution of sodium sulfite (14.4 g, 0.1144 mol) in H2O (63 mL) was added with stirring such that the internal temperature remained below 14° C. The cooling bath was removed and the mixture was stirred at room temperature for 30 min. The reaction mixture was extracted five times with chloroform, and the combined organic phase was dried (MgSO4), filtered and concentrated to afford 16.4 g of the title compound of Step C as a clear oil. 1H NMR (300 MHz, CDCl3): δ 4.43 (d,1H, J=15.9 Hz), 4.30-4.24 (m,4H), 1.52 (s,9H), 1.38 (t,6H, J=6.9 Hz).
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