[F:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][CH3:9])=[CH:4][C:3]=1[C:10]1[CH:15]=[CH:14][C:13]([C:16]([O:18][CH3:19])=[O:17])=[CH:12][C:11]=1[CH:20]1[CH:24]([CH3:25])[CH2:23][CH2:22][CH:21]1[OH:26].[CH3:27][S:28](Cl)(=[O:30])=[O:29]>C(Cl)Cl>[F:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][CH3:9])=[CH:4][C:3]=1[C:10]1[CH:15]=[CH:14][C:13]([C:16]([O:18][CH3:19])=[O:17])=[CH:12][C:11]=1[CH:20]1[CH:21]([O:26][S:28]([CH3:27])(=[O:30])=[O:29])[CH2:22][CH2:23][CH:24]1[CH3:25]A 250 mL round bottom flask was charged with 66.56D (mixture of diastereomers) (0.61 g, 1.7 mmol), DCM (10 mL), and TEA (0.28 mL, 2.0 mmol) and cooled to 0° C. To the cold solution was added methanesulfonyl chloride (available from Aldrich) (0.16 mL, 2.0 mmol) dropwise. The cooling bath was removed, and the mixture was stirred for 1 hour at ambient temperature. The mixture was diluted with EtOAc, washed with water and brine, dried (MgSO4), and concentrated. The crude product was purified by silica gel flash chromatography (0-40% EtOAc/hexane) to afford 66.56E (mixture of diastereomers) (0.69 g, 93% yield) as a colorless oil.
Wird geladen…