摘要:
Radical promoted cyclization of enantiomerically pure substituted 1,1-dichloro-1-fluoro-3-[(4-methylphenyl)sulfinyl]hex-5-en-2-ols (6) afforded the title compounds 12 in good overall yields. The regio and stereochemical outcome of the cyclizations are explained by considering the respective transition states. The structure and configuration of the products were elucidated with the aid of H-1, C-13 and F-19 NMR spectra and H-1-{H-1} and H-1-{F-19} NOE difference experiments.