[C:1]([C@H:4]1[CH2:9][CH2:8][C@@H:7]([CH3:10])[CH2:6][C@@H:5]1[OH:11])(C)=[CH2:2].[O:12]=[O+][O-].O=O>C(Cl)Cl.CO>[OH:11][C@H:5]1[CH2:6][C@H:7]([CH3:10])[CH2:8][CH2:9][C@H:4]1[C:1](=[O:12])[CH3:2]To the (1S,2R,5R)-2-Isopropenyl-5-methyl-cyclohexanol (2.07 g, 13.42 mmol) in DCM (67 mL) and MeOH (1.6 mL) at −78° C. was bubbled ozone/oxygen gas until the reaction mixture was turned blue and the excess ozone was flushed off with oxygen, Dimethyl sulfide (4.9 mL) was added at the same temperature, slowly warmed up to room temperature, stirred for over night, concentrated, purified on column chromatography using 10-20% EtOAc/hexane to give (1R,2S,4R)-1-(2-Hydroxy-4-methyl-cyclohexyl)-ethanone (1.40 g, 67%) as an oil. NMR 1H (CDCl3, 400 MHz): 4.29-4.27 ppm (m, 1H); 2.40-2.35 ppm (m, 1H); 2.19 ppm (s, 3H); 1.91-1.73 ppm (m, 5H); 1.05-0.91 ppm (m, 2H); 0.88 ppm (d, 3H).
Wird geladen…
