[CH2:1]([O:8][CH:9]1[CH2:12][CH:11]([OH:13])[CH2:10]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.ClCCl.C(N(CC)CC)C.[CH3:24][S:25](Cl)(=[O:27])=[O:26]>O>[CH3:24][S:25]([O:13][CH:11]1[CH2:12][CH:9]([O:8][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)[CH2:10]1)(=[O:27])=[O:26]A 100-mL round-bottom flask was charged with 3-(benzyloxy)cyclobutanol (1.83 g, 10.3 mmol), dichloromethane (20 mL) and triethylamine (2.15 mL, 15.4 mmol), and the solution was cooled to 0° C. Methanesulfonyl chloride (1.20 mL, 1.77 g, 15.4 mmol) was added dropwise, and the resulting solution stirred for 30 min at 0° C. The reaction mixture was poured into water (30 mL) and extracted with dichloromethane (2×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated to afford 3-(benzyloxy)cyclobutyl methanesulfonate (2.60 g, 99%) as a light yellow solid. MS (ESI, pos. ion) m/z 257 [M+H]+.
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