Published as part of the 50 Years SYNTHESIS – Golden Anniversary Issue
Abstract
The first total synthesis of natural (+)-cycloclavine uses a catalytic asymmetric cyclopropanation of allene, a regiospecific Pd-catalyzed enone formation, and two intramolecular Diels–Alder reactions for indole/indoline annulations. The binding properties of natural (+)- and unnatural (–)-cycloclavine on 16 CNS receptors revealed significant stereospecificity and unique binding profiles in comparison to LSD, psilocin, and DMT. Differential 5-HT affinities, as well as novel sigma-1 receptor properties bode well for potential therapeutic developments of clavine alkaloid scaffolds.
Key words
clavine ergot alkaloids - enantioselective allene cyclopropanation - psychedelics - stereospecific GPCR binding - LSD - psilocin - DMT - 5-HTA - sigma-1 receptors