A synthetically challenging tetracyclic tertiary amine framework in the Daphniphyllum alkaloid daphenylline was established in a six-step sequence featuring an intermolecular Diels–Alder cycloaddition/oxidative aromatization sequence. The utilization of an amine–borane complexation strategy is the key to successful transformations on our tertiary amine substrates.
Synthesis of the<i>Strychnos</i>Alkaloid (−)-Strychnopivotine and Confirmation of its Absolute Configuration
作者:Gaëtan Maertens、Sylvain Canesi
DOI:10.1002/chem.201601319
日期:2016.5.17
synthesis of (−)‐strychnopivotine from a known and inexpensive phenol has been achieved in 15 steps. The strategy is based on a new diastereoselective aza‐Michael‐enol‐ether cascade desymmetrization of a dienone, guided by a removable lacticacid‐derivedchiral auxiliary. Synthesis involves a phenol dearomatization, a conjugated silicon addition, a stereoselective double reductive amination, and two