Patent ID: 6136980
Filing Date: 2000-10-24
Classification: C07D

Abstract:
A process for preparing a 6,7-benzomorphanderivative of the formula 11, wherein a N-formyl-2-phenylmethyl-3,3-dimethyl-4-methylene-piperidine of the formula 10 ##STR13## wherein R.sub.2 denotes hydrogen C.sub.1 -C.sub.6 -alkyl, halogen, C.sub.1 -C.sub.8 -alkoxy, a benzoyl group bound via an oxygen or an alkylcarboxyl group having a straight chained or branched C.sub.1 -C.sub.6 -lower alkyl group--wherein the alkyl group may optionally be substituted by one or more halogen atoms which may be identical or different;is contacted with a Lewis-acid, to give the corresponding benzomorphane derivative of general formula