Seventeen polycyclic compounds related to tactine and huperzine A have been prepared as racemic mixtures and tested as acetylcholinesterase (ACHE) inhibitors. The conjunctive pharmacomodulation of huperzine A (carbobicyclic substructure) and tactine (4-aminoquinoline substructure) led to compound 7jy, 2.5 times less active than tacrine as AChE inhibitor, but much more active than its (Z)-stereoisomer (7iy). Derivatives 7dy and 7ey, lacking the ethylidene substituent, showed to be more active than tactine. Many other structural modifications of 7jy led to less active compounds. Compounds 7dy and 7ey also showed to be much more active than tactine in reversing the partial neuromuscular blockade induced by d-tubocurarine.
- Acetylcholinesterase inhibitors
- Alzheimer's disease
- Friedlander reaction
- Huperzine A-related compounds
- Tacrine-related compounds