Synthesis of Pyridines and Pyrazines Using an Intramolecular Hydroamination-Based Reaction Sequence
作者:Toni Rizk、Eric J.-F. Bilodeau、André M. Beauchemin
DOI:10.1002/anie.200903922
日期:2009.10.19
A management issue! Various pyridines and pyrazines can be efficiently accessed from simple acyclic precursors using an intramolecularhydroamination/isomerization/aromatization sequence (see scheme). p‐Toluenesulfonic acid (2 mol %) is used to catalyze this novel alkyne annulation, in which the oxime group allows for a subsequent redox‐neutral aromatization step to occur.