A Short and Efficient Total Synthesis of (+)-Deoxoprosopinine via Diastereoselective Allylation of the Bicyclic N-Acyl Iminium Ion Formed in situ with a π-Nucleophile

A short and efficient synthesis of (+)-deoxoprosopinine is reported involving Miyashita endoselective epoxide ring-opening reaction, diastereoselective allylation of the bicyclic N -acyl iminium ion formed in situ with a π-nucleophile, and olefin cross-metathesis as the key steps.