Preparation of 3 alpha-Fluoro- and 3 beta-Fluoro derivatives of 5 alpha-androst-16-enes and androsta-5,16-dienes.
2125 - 2135.
n-Perfluorobutanesulfonyl fluoride, in the presence of DBU, is shown to be a convenient and satisfactory reagent for the preparation of a variety of unsaturated 3-fluorosteroids of defined stereochemistry. 3-Fluoro-16,17-dehydrosteroids are reported for the first time. Fluorodehydroxylation proceeded with retention of configuration for 5,6,16,17-tetradehydro-3beta-sterols, but with inversion for their 3alpha-analogues, as it did for several 16,17-dehydrosterols.
|Title:||Preparation of 3 alpha-Fluoro- and 3 beta-Fluoro derivatives of 5 alpha-androst-16-enes and androsta-5,16-dienes|
|Keywords:||3-Fluorosteroids, fluorodehydroxylation, n-perfluorobutanesulfonyl fluoride, STEROIDS, MECHANISM, ALCOHOLS, SWEAT|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry|
Archive Staff Only