[C:1]([O:5][C:6](=[O:14])[NH:7][CH2:8][CH2:9][O:10][CH2:11][CH2:12][OH:13])([CH3:4])([CH3:3])[CH3:2].C(N(CC)CC)C.[CH3:22][S:23](Cl)(=[O:25])=[O:24].O>ClCCl>[CH3:22][S:23]([O:13][CH2:12][CH2:11][O:10][CH2:9][CH2:8][NH:7][C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:14])(=[O:25])=[O:24]tert-Butyl[2-(2-hydroxyethoxy)ethyl]carbamate (Step 1, 3.73 g, 18 mmol) was diluted in dichloromethane (75 mL) and cooled to 0° C. Triethylamine (3.0 mL, 22 mmol) was added, followed by methanesulfonyl chloride (1.7 mL, 22 mmol). After stirring at rt for 1 h, water was added. The aqueous layer was separated and extracted with dichloromethane. The combined organics were dried and concentrated in vacuo to afford the title compound as an oil. 1H NMR (CDCl3) δ: 1.44 (9H, s), 3.06 (3H, s), 3.32 (2H, m), 3.56 (2H, t), 3.72 (2H, m), 4.36 (2H, m).
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