[OH:1][CH2:2][CH2:3][C:4]1([NH:7][C:8](=[O:14])[O:9][C:10]([CH3:13])([CH3:12])[CH3:11])[CH2:6][CH2:5]1.C(N(CC)CC)C.[S:22](Cl)([CH3:25])(=[O:24])=[O:23]>ClCCl>[CH3:25][S:22]([O:1][CH2:2][CH2:3][C:4]1([NH:7][C:8]([O:9][C:10]([CH3:11])([CH3:13])[CH3:12])=[O:14])[CH2:5][CH2:6]1)(=[O:24])=[O:23]To a solution of 6.472 g (32.16 mmol) of tert-butyl 1-(2-hydroxyethyl)cyclopropylcarbamate in 61 ml of anhydrous dichloromethane was added 12.79 ml (91 mmol) of anhydrous triethylamine. The resulting mixture is cooled at −20° C. Then 3.54 ml (45.66 mmol) of mesyl chloride in 11 ml of anhydrous dichloromethane was added. The resulting mixture was stirred at room temperature for 2 h. The mixture was poured into ice-water and the organic layer was washed with saturated aqueous sodium chloride, dried over sodium sulfate and evaporated. The crude product was triturated with petroleum ether and filtered to give 7.82 g of pure product as an orange solid. Mp: 88-89° C.
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