Asymmetric Total Syntheses of (−)-Jerantinines A, C, and E, (−)-16-Methoxytabersonine, (−)-Vindoline, and (+)-Vinblastine

A concise and stereocontrolled strategy for the syntheses of oxygenated Aspidosperma and Vinca alkaloids, via a stereoselective intermolecular inverse-electron-demand 4 + 2 cycloaddition, a challenging α,β-unsaturated ketone indolization rearrangement with excellent regio- and stereoselectivity, and an efficient Pd/C-catalyzed one-pot cascade reaction. The strategy has been demonstrated by the efficient asymmetric syntheses of antitumor drug (+)-vinblastine and five other oxygenated Aspidosperma alkaloids.