[OH:1][CH2:2][C@@H:3]([NH:5][C:6](=[O:12])[O:7][C:8]([CH3:11])([CH3:10])[CH3:9])[CH3:4].C(N(CC)CC)C.[CH3:20][S:21](Cl)(=[O:23])=[O:22]>C(Cl)Cl>[CH3:20][S:21]([O:1][CH2:2][C@@H:3]([NH:5][C:6]([O:7][C:8]([CH3:11])([CH3:10])[CH3:9])=[O:12])[CH3:4])(=[O:23])=[O:22](S)-tert-Butyl 1-hydroxypropan-2-ylcarbamate (10.25 g, 58.5 mmol) was dissolved DCM (20 ml). Triethylamine (12.23 ml, 87.7 mmol) was added and the solution was cooled to 0° C. under nitrogen. Methanesulfonylchloride (5.0 ml, 64.3 mmol) was diluted with DCM (5 ml) and added drop wise to the reaction mixture keeping the temperature under 10° C. After addition, the reaction mixture was allowed to warm up to RT and stirring was continued for 36 h. Next, the reaction mixture was diluted with DCM (150 ml) and washed several times with NaHCO3-solution and water, the organic layer dried with Na2SO4, filtered and evaporated affording 8.78 g of the title compound. 1H-NMR (400 MHz; d6-DMSO): δ 1.06 (d, 3H), 1.38 (s, 9H), 3.16 (s, 3H), 3.75 (m, 1H), 4.04 (m, 2H), 6.93 (m, 1H).
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