B/C-cis- and -trans-1,3,4,9,10,10a-Hexahydro-2H-10,4a-methanoiminoethanophenanthrene (homo- and homoisomorphinan) derivatives as analgesics.

N-Alkyl derivatives of B/C-cis- and B/C-trans-6-hydroxy-1,3,4,9,10,10a-hexahydro-2H-10,4a-methanoimino-ethanophenanthrene have been prepared. The analgesic potency and physical dependence capacity of these compounds were determined. The N-methyl derivatives were analgesically equipotent with morphine. None of these compounds except the N-methyl-B/C-trans isomer 2b suppressed or precipitated the abstinence syndrome. Compound 2b was a narcotic agonist. The N-methyl-B/C-cis compound 2a appears to warrant further examination for its potential as a potent analgesic having no physical dependence liability.