Cu–benzotriazole-catalyzed electrophilic cyclization of N-arylimines: a methodical tandem approach to O-protected-4hydroxyquinazolines-
作者:Satyanarayana Battula、Ram A. Vishwakarma、Qazi Naveed Ahmed
DOI:10.1039/c4ra07377k
日期:——
A remarkably efficient approach to O-protected-4-hydroxyquinazolines has been developed via the copperâbenzotriazole (CuâBtH)-catalyzed intramolecular electrophilic cyclization of N-arylimines, achieved through the reaction of 2-aminobenzonitriles and various aldehydes.
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
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.