A Short Synthesis of Vellosimine and Its Derivatives

Abstract

Rapid access to both enantiomers of vellosimine and its derivatives is secured from a readily affordable C2-symmetric 9-azabicyclo[3.3.1]nonane precursor available in both enantiomeric forms. The strategy reported leverages desymmetrization via intramolecular cyclization used to assemble the key intermediate with two differentiated carbonyl groups. Late-stage site selective indolization enables a concise synthesis of vellosimines and a straightforward diversification of the alkaloid scaffold.