Selective C-Arylation of Free (NH)-Heteroarenes via Catalytic C−H Bond Functionalization
作者:Bengü Sezen、Dalibor Sames
DOI:10.1021/ja034848+
日期:2003.5.1
palladium-catalyzed arylation of a broad spectrum of free (NH)-heteroarenes has been developed (indole, pyrrole, pyrazole, 2-phenylimidazole, imidazole, benzimidazole, and purine). Remarkable selectivity has been achieved in the presence of MgO base, providing single C-arylation products, while no N-arylation and no bis-arylation products have been detected. In the case of free imidazole, exclusive C-4 arylation may
Oxidative Cyclization Approach to Benzimidazole Libraries
作者:Eric P. Arnold、Prolay K. Mondal、Daniel C. Schmitt
DOI:10.1021/acscombsci.9b00189
日期:2020.1.13
building blocks, providing limited chemical space coverage. We have developed an amidine formation/oxidativecyclization sequence that enables anilines as a diversity set for benzimidazole C4–C7 SAR generation in parallel format. The amidine annulation was achieved using PIDA or Cu-mediated oxidation to access both N–H and N–alkyl benzimidazoles. This library protocol has now been utilized for analog