[OH:1][CH2:2][C:3]1([C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH2:6][CH2:5][CH2:4]1.C(N(CC)CC)C.[CH3:19][S:20](Cl)(=[O:22])=[O:21]>C(Cl)Cl>[CH3:19][S:20]([O:1][CH2:2][C:3]1([C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH2:6][CH2:5][CH2:4]1)(=[O:22])=[O:21]To a solution of ethyl 1-(hydroxymethyl)cyclobutanecarboxylate (1.0 g, 6.3 mmol) and N,N-diethylethanamine (1.5 g, 8.2 mmol) in CH2Cl2 (30 ml) was added methanesulfonyl chloride (869 mg, 7.6 mmol). The mixture was stirred for 6 hours at ambient temperature. After dilution with CHCl3 and H2O, the organic layer was washed with H2O, dried over MgSO4, and concentrated in vacuo to give ethyl 1-{[(methylsulfonyl)oxy]methyl}cyclobutanecarboxylate (1.2 g).
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