Hypervalent Iodine Mediated para-Selective Fluorination of Anilides
摘要:
A metal-free method for the direct regioselective fluorination of anilides has been developed. In the presence of bis(tert-butylcarbonyloxy)iodobenzene (PhI(OPiv)(2)) and hydrogen fluoride-pyridine, the para-fluorination products of anilides were obtained in moderate to good yields. Because of its operational safety and the use of readily available reagents, this new procedure provides facile access to a variety of para-fluorinated anilides.
Environmentally friendly one-pot synthesis of amides, bis-amides and dipeptides by mechanochemical carbodiimide-mediated coupling of carboxylicacids and amines is described; high reaction yields and simple aqueous work-up allow for the clean, practical and fast preparation of a variety of compounds containing the amide bond from readily accessible reagents.
In this study, a series of thirty-five substituted quinoline-2-carboxamides and thirty-three substituted naphthalene-2-carboxamides were prepared and characterized. They were tested for their activity related to the inhibition of photosynthetic electron transport (PET) in spinach (Spinacia oleracea L.) chloroplasts. Primary in vitro screening of the synthesized compounds was also performed against four mycobacterial species. N-Cycloheptylquinoline-2-carboxamide, N-cyclohexylquinoline-2-carboxamide and N-(2-phenylethyl)quinoline-2-carboxamide showed higher activity against M. tuberculosis than the standards isoniazid or pyrazinamide and 2-(pyrrolidin-1-ylcarbonyl)quinoline and 1-(2-naphthoyl)pyrrolidine expressed higher activity against M. kansasii and M. avium paratuberculosis than the standards isoniazid or pyrazinamide. The most effective antimycobacterial compounds demonstrated insignificant toxicity against the human monocytic leukemia THP-1 cell line. The PET-inhibiting activity expressed by IC50 value of the most active compound N-benzyl-2-naphthamide was 7.5 μmol/L. For all compounds, the structure-activity relationships are discussed.
The challenging transamidation of unactivated tertiary amides using equivalent amounts of amines has been accomplished via cooperative acid/iodide catalysis. The method provides a novel manifold to re-route the reactivity of unactivated and unreactive N,N-dialkyl amides through reactive acyl iodide intermediates, representing a powerful new activation mode of unactivated amide bonds.
Amide-based inhibitors of p38α MAP kinase. Part 1: Discovery of novel N-pyridyl amide lead molecules
作者:Gregory R. Luedtke、Kurt Schinzel、Xuefei Tan、Richland W. Tester、Imad Nashashibi、Yong-jin Xu、Sundeep Dugar、Daniel E. Levy、Joon Jung
DOI:10.1016/j.bmcl.2010.02.088
日期:2010.4
A novel series of N-pyridyl amides as potent p38 alpha kinase inhibitors is described. Based on the structural similarities between the initial hit and a well-known imidazole pyrimidine series of p38 alpha inhibitors, potencies within the newly discovered series were quickly improved by installation of an (S)-alpha-methylbenzyl moiety at the 2-position of the pyridine ring. The proposed binding modes of the new series to p38 alpha were evaluated against SAR findings and provided rationale for further development of this series of molecules. (C) 2010 Elsevier Ltd. All rights reserved.