Total Synthesis of (−)-Vindoline and (+)-4-Epi-Vindoline Based on a 1,3,4-Oxadiazole Tandem Intramolecular [4 + 2]/[3 + 2] Cycloaddition Cascade Initiated by an Allene Dienophile

Organic Letters - United States

doi 10.1021/acs.orglett.5b02818