[CH3:1][S:2](Cl)(=[O:4])=[O:3].[OH:6][CH:7]1[CH2:12][CH2:11][CH:10]([C:13]([O:15][CH2:16][CH3:17])=[O:14])[CH2:9][CH2:8]1.C(N(CC)CC)C>ClCCl>[CH3:1][S:2]([O:6][CH:7]1[CH2:8][CH2:9][CH:10]([C:13]([O:15][CH2:16][CH3:17])=[O:14])[CH2:11][CH2:12]1)(=[O:4])=[O:3]Methanesulfonyl chloride (2.4 mL, 31 mmol) was slowly added to a dichloromethane solution (75 mL) of ethyl 4-hydroxycyclohexanecarboxylate (4.63 mL, 28.7 mmol) and triethylamine (8.2 mL, 59 mmol) at 0° C. The reaction mixture was stirred for 30 minutes, concentrated in vacuo and diluted in diethyl ether (100 mL). The solution was washed with 10% hydrochloric acid (25 mL), water (25 mL), and saturated sodium bicarbonate (15 mL). The organics were dried (magnesium sulfate) and concentrated in vacuo to afford the title compound. 1H NMR (500 MHz, CDCl3) δ 1.23 (t, J=7.1 Hz, 3H), 1.54-1.82 (m, 4H), 1.87-1.97 (m, 2H), 2.00-2.08 (m, 2H), 2.34-2.41 (m, 1H), 3.00 (s, 3H), 4.13 (q, J=7.1 Hz, 2H), 4.88-4.92 (m, 1H).
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