Synthesis of Pyridopyrrolo[2,1-a]isoindoles by Palladium-catalyzed Annulation
作者:Eul Kgun Yum、Song Su Kang、Nack-Do Sung
DOI:10.3987/com-03-9895
日期:——
Synthesis of <i>N</i>-Substituted 3-Amino-4-halopyridines: A Sequential Boc-Removal/Reductive Amination Mediated by Brønsted and Lewis Acids
作者:Christopher A. Wilhelmsen、Alexandre D.C. Dixon、John D. Chisholm、Daniel A. Clark
DOI:10.1021/acs.joc.7b02966
日期:2018.2.2
readily provide access to imidazopyridines and similar heterocyclic systems. The direct synthesis of N-substituted 3-amino-4-halopyridines is problematic, as reductive aminations and base-promoted alkylations are difficult in these systems. A high yielding deprotection/alkylation protocol mediated by trifluoroacetic acid and trimethylsilyl trifluoromethanesulfonate is described, providing access to a wide