[Cr](Cl)([O-])(=O)=O.[NH+]1C=CC=CC=1.[Cl:12][C:13]1[CH:18]=[CH:17][C:16]([CH2:19][CH2:20][CH2:21][CH2:22][OH:23])=[CH:15][CH:14]=1>C(Cl)Cl>[Cl:12][C:13]1[CH:14]=[CH:15][C:16]([CH2:19][CH2:20][CH2:21][CH:22]=[O:23])=[CH:17][CH:18]=1To a suspension of pyridinium chlorochromate (PCC) (5 g) in CH2Cl2 (200 mL) and 4 angstrom molecule sieves (5 g) was added the alcohol (2 g) (Step II). The mixture was stirred 2 hr at RT, filtered through celite and evaporated. Flash chromatography using 25% ethyl acetate in hexane afforded the title compound.
Wird geladen…