Advancing alkaloid synthesis: (+)‐Haplophytine (see structure) was the target of a total synthesis featuring a highly stereoselective intramolecular Mannich reaction, Friedel–Crafts alkylation, oxidative rearrangement, and Fischer indole synthesis.
convergent total synthesis of (+)‐haplophytine, a dimeric indole alkaloid with diazabicyclo[3.3.1]nonane and hexacyclic aspidosperma segments, is described. This synthesis involves the direct coupling of the two segments in a AgNTf2‐mediated Friedel–Crafts reaction and construction of the diazabicyclo[3.3.1]nonane skeleton through late‐stage chemoselective aerobic oxidation of the 1,2‐diaminoethene moiety