Heteroaromatic-aminomethyl quinolones: Potent and selective iNOS inhibitors
摘要:
The overproduction of nitric oxide during the biological response to inflammation by the nitric oxide synthase (NOS) enzymes have been implicated in the pathology of many diseases. By removal of the amide core from uHTS-derived quinolone 4, a new series highly potent heteroaromatic-aminomethyl quinolone iNOS inhibitors 8 were identified. SAR studies led to identification of piperazine 22 and pyrimidine 32, both of which reduced plasma nitrates following oral dosing in a mouse lipopolysaccharide challenge assay. (C) 2011 Elsevier Ltd. All rights reserved.
Lewis Acid Activation of Pyridines for Nucleophilic Aromatic Substitution and Conjugate Addition
作者:Sarah Abou-Shehada、Matthew C. Teasdale、Steven D. Bull、Charles E. Wade、Jonathan M. J. Williams
DOI:10.1002/cssc.201403154
日期:2015.3
clean, mild and sustainable method for the functionalization of pyridines and their analogues is reported. A zinc‐based Lewis acid is used to activate pyridine and its analogues towards nucleophilic aromatic substitution, conjugate addition, and cyclization reactions by binding to the nitrogen on the pyridine ring and activating the pyridine ring core towards further functionalization.
Direct activation of amine N−H bonds is realized to provide N-radicals in a redox-neutral and site-selective manner. Under visible-light irradiation of quantum dots, the N-radicals are successfully applied to the synthesis of aromatic amines. The high efficiency and broad functional-group tolerance demonstrate the potential of photocatalytic N-radicals in the construction of valuable arylamines.