[CH3:1][C:2]([O:6][CH2:7][CH:8]1[CH2:10][O:9]1)([CH3:5])[CH2:3][OH:4].CC1(C)C2(CS(O)(=O)=O)C(CC1CC2)=O.C([O-])(O)=O.[Na+]>C(Cl)Cl.CC1(C)C2(CS(O)(=O)=O)C(CC1CC2)=O>[CH3:1][C:2]1([CH3:5])[CH2:3][O:4][CH:8]([CH2:10][OH:9])[CH2:7][O:6]12-Methyl-2-(oxiran-2-ylmethoxy)propan-1-ol (870 mg, 5.95 mmol) and 10-CSA (207 mg, 15%) were dissolved in DCM (70 mL) and stirred at ambient temperature for 24 hr. More 10-CSA (100 mg) was added and the solution was stirred overnight. Saturated NaHCO3 solution was added. The two layers were separated and the aqueous layer was extracted twice with DCM. The organic layers were combined, dried over Na2SO4 and concentrated to give the product as a colorless oil (750 mg, 86%). 1H NMR (400 MHz, CDCl3) δ ppm 3.69-3.74 (1H, m), 3.52-3.64 (5H, m), 3.43 (1H, dd, J=11.6, 0.8 Hz), 2.57 (1H, br s), 1.32 (3H, s), 1.13 (3H, s).
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