C(N(CC)CC)C.[CH3:8][S:9](Cl)(=[O:11])=[O:10].[O:13]1[CH2:17][CH2:16][CH:15]([CH2:18][CH2:19][OH:20])[CH2:14]1.O>ClCCl>[O:13]1[CH2:17][CH2:16][CH:15]([CH2:18][CH2:19][O:20][S:9]([CH3:8])(=[O:11])=[O:10])[CH2:14]1Triethylamine (2.1 mL, 15 mM) and methanesulfonyl chloride (0.85 mL, 11 mM) were added drop wise to a cold (−5 to −10° C.) solution of 2-(tetrahydro-furan-3-yl)-ethanol (1.14 g, 10 mM) in dichloromethane (15 mL). The reaction was stirred for 20 min at this temp then water (10 mL) was added and the reaction was stirred an additional 10 min then the phases were separated and the aqueous phase was extracted with dichloromethane (3×20 mL). The combined organics were washed with 50% aqueous HCl, sat. NaHCO3, dried (MgSO4), filtered and concentrated to give a quantitative yield of methanesulfonic acid 2-(tetrahydrofuran-3-yl)-ethyl ester.
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