| abstract |
The present invention relates to process for the preparation of a 14-hydroxynormorphinone derivative of formula IV n n ncomprising reacting the compound of formula III, n nwith a cobalt (II) oxidant in the presence of a mild base and air or oxygen as the cooxidant; n nwherein R 1 is (1C-7C)alkyl optionally substituted with one or more chlorines, butenyl, vinyl, benzyl, phenyl or naphthyl; and R 2 is benzyl or benzyl substituted with one or more (1C-6C)alkoxy group or benzyl substituted with one or more halogen. nThe process is very suitable in the production of noroxymorphone. |