[CH3:1][C:2]1([CH3:10])[CH2:7][O:6][CH:5]([CH2:8][OH:9])[CH2:4][O:3]1.[CH3:11][S:12](Cl)(=[O:14])=[O:13].C([O-])(O)=O.[Na+]>C(Cl)Cl>[CH3:11][S:12]([O:9][CH2:8][CH:5]1[CH2:4][O:3][C:2]([CH3:10])([CH3:1])[CH2:7][O:6]1)(=[O:14])=[O:13](5,5-Dimethyl-1,4-dioxan-2-yl)methanol (740 mg, 5.06 mmol) and TEA (0.988 mL, 7.09 mmol) were dissolved in DCM (20 mL). At 0° C. MsCl (0.473 mL, 6.07 mmol) was added dropwise. After the addition the solution was warmed to ambient temperature and stirred for 1 hr. Saturated NaHCO3 solution was added and the two layers were separated. The aqueous layer was extracted three times with DCM. The organic layers were combined, dried over Na2SO4 and concentrated. The resulting residue was purified on a silica gel column (heptane:EtOAc 4:1 to 1:1) to give the product as a colorless oil (805 mg, 71%). 1H NMR (400 MHz, CDCl3) δ ppm 4.18-4.19 (2H, m), 3.71-3.76 (1H, m), 3.66 (1H, t, J= 10.8 Hz), 3.52-3.57 (2H, m), 3.37 (1H, d, J= 11.6 Hz), 3.03 (3H, s), 1.28 (3H, s), 1.09 (3H, s).
Wird geladen…
