Total synthesis of 1.alpha.-fluoro-25-hydroxycholecalciferol and -ergocalciferol

Synthese des composes du titre a partir de (dimethyl-1',5' trimethylsiloxy-5') hexyl-1 (ou [dimethyl-1',4' trimethylsiloxy-5'] hexene-2 yl)-methyl-7a perhydro indenone-4 et d'oxyde de [t-butyldimethylsiloxy-5' fluoro-3' methylene-2' cyclohexylidene]-2 ethyl diphenyl phosphine