A Palladium-Catalyzed Aminoalkynylation Strategy towards Bicyclic Heterocycles: Synthesis of (±)-Trachelanthamidine
作者:Stefano Nicolai、Cyril Piemontesi、Jérôme Waser
DOI:10.1002/anie.201100718
日期:2011.5.9
Sweet cyclizations: The synthesis of pyrrolizidines and indolizidines has been achieved. Olefins were subjected to an intramolecular palladium‐catalyzed aminoalkynylation with the hypervalent iodine reagent TIPS‐EBX. After removal of the protecting group, a two‐step cyclization sequence and subsequent reduction led to the natural product (±)‐trachelanthamidine (see scheme; TIPS‐EBX=triisopropylsilyl