Overcoming the Limitations of C−H Activation with Strongly Coordinating N-Heterocycles by Cobalt Catalysis
作者:Hui Wang、Mélanie M. Lorion、Lutz Ackermann
DOI:10.1002/anie.201603260
日期:2016.8.22
Stronglycoordinating nitrogen heterocycles, including pyrimidines, oxazolines, pyrazoles, and pyridines, were fully tolerated in cobalt‐catalyzed C−H amidations by imidate assistance. Structurally complex quinazolines are thus accessible in a step‐economic manner. Our findings also establish the relative powers of directing groups in cobalt(III)‐catalyzed C−H functionalization for the first time.
We developed an unprecedented iridium-catalyzed C−H activation/cyclization to synthesize isoquinoline compounds efficiently using ethyl benzimidate and N-alkoxyamides. This reaction has the advantages of wide substrate adaptability, short reaction times and no need for an inert atmosphere. In addition, some drug molecules smoothly converted into aminating reagents, reacted efficiently and afforded