Transition-Metal-Free Cross-Coupling Reactions in Dynamic Thin Films To Access Pyrimidine and Quinoxaline Analogues
作者:Louisa A. Ho、Colin L. Raston、Keith A. Stubbs
DOI:10.1002/ejoc.201600830
日期:2016.12
The vortex fluidic device (VFD) is effective in modulating the synthesis of pyrimidine and quinoxaline-based compounds at room temperature and in high yield. The formation of the C–N bond occurs in the absence of a transition-metal catalyst, which avoids the contamination of the products with trace amounts of a transition metal. The systematic investigation of the operating parameters for the microfluidic
Copper-catalyzed, ceric ammonium nitrate mediated <i>N</i>-arylation of amines
作者:Uma Maheshwar Gonela、Seth Y. Ablordeppey
DOI:10.1039/c8nj06145a
日期:——
reported. This 'Chan-Evans-Lam' reaction has revealed that at room temperature, catalytic copper(II) acetate and cericammoniumnitrate (CAN) as an oxidant, N-arylation can result in an effective C-N bond formation. This air stable, practical, robust protocol enables a variety of functional group tolerance on both boronic acid and amine partners.
AbstractA new class of large‐but‐flexible Pd‐BIAN‐NHC catalysts (BIAN=acenaphthoimidazolylidene, NHC=N‐heterocyclic carbene) has been rationally designed to enable the challenging Buchwald‐Hartwig amination of coordinating heterocycles. This robust class of BIAN‐NHC catalysts permits cross‐coupling under practical aerobic conditions of a variety of heterocycles with aryl, alkyl, and heteroarylamines, including historically challenging oxazoles and thiazoles as well as electron‐deficient heterocycles containing multiple heteroatoms with BIAN‐INon (N,N′‐bis(2,6‐di(4‐heptyl)phenyl)‐7H‐acenaphtho[1,2‐d]imidazol‐8‐ylidene) as the most effective ligand. Studies on the ligand structure and electronic properties of the carbene center are reported. The study should facilitate the discovery of even more active catalyst systems based on the unique BIAN‐NHC scaffold.
COMPOUNDS FOR THE TREATMENT OF PERIODONTAL DISEASE