C(N(S(F)(F)[F:7])CC)C.[C:10]([O:14][C:15](=[O:29])[NH:16][C@H:17]([C:22]([N:24]1[CH2:27][CH:26](O)[CH2:25]1)=[O:23])[C@@H:18]([CH3:21])[CH2:19][CH3:20])([CH3:13])([CH3:12])[CH3:11]>ClCCl.C(OCC)(=O)C>[C:10]([O:14][C:15](=[O:29])[NH:16][C@H:17]([C:22]([N:24]1[CH2:27][CH:26]([F:7])[CH2:25]1)=[O:23])[C@@H:18]([CH3:21])[CH2:19][CH3:20])([CH3:13])([CH3:12])[CH3:11]To a cooled (−78° C.) solution of diethylaminosulfur trifluoride (0.46 mL, 3.5 mmol) in dichloromethane (6 mL), was added dropwise a solution of [(1S,2S)-1-(3-hydroxy-azetidine-1-carbonyl)-2-methyl-butyl]-carbamic acid tert-butyl ester (1.0 g, 3.5 mmol) in dichloromethane (4 mL). The mixture was warmed to room temperature, stirred overnight, then diluted with ethyl acetate and poured into ice/water. The layers were separated, and the organic phase washed with water and brine, dried over magnesium sulfate and concentrated. The product was purified by flash-chromatography (ethyl acetate) and isolated as an oil (250 mg, 25%).
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