Natural α-methylenelactam analogues: Design, synthesis and evaluation of α-alkenyl-γ and δ-lactams as potential antifungal agents against Colletotrichum orbiculare
摘要:
In our continued efforts to improve the potential utility of the alpha-methylene-gamma-lactone scaffold, 62 new and 59 known natural alpha-methylenelactam analogues including alpha-methylene-gamma- lactams, alpha-arylidene- gamma and delta-lactams, and 3-arylideneindolin-2-ones were synthesized as the bioisosteric analogues of the amethylenelactone scaffold. The results of antifungal and cytotoxic activity indicated that among these derivatives compound (E)-1-(2, 6-dichlorobenzyl)-3-(2-fluorobenzylidene) pyrrolidin-2-one (Py51) possessed good selectivity with the highest antifungal activity against Colletotrichum orbiculare with IC50 - 10.4 mu M but less cytotoxic activity with IC50 - 141.2 mu M (against HepG2 cell line) and 161.2 mu M ( against human hepatic L02 cell line). Ultrastructural change studies performed by transmission electron microscope showed that Py51 could cause important cell morphological changes in C. orbiculare, such as plasma membrane detached from cell wall, cell wall thickening, mitochondria disruption, a dramatic increase in vacuolation, and eventually a complete loss in the integrity of organelles. Significantly, mitochondria appeared one of the primary targets, as confirmed by their remarkably aberrant morphological changes. Analysis of structureeactivity relationships revealed that incorporation of the aryl group into the alpha-exo methylene and the N-benzyl substitution increased the activity. Meanwhile, the alpha-arylidene-gamma-lactams have superiority in selectivity over the 3-arylideneindolin-2-ones. Based on the results, the N- benzyl substituted a-(2-fluorophenyl)-gamma-lactam was identified as the most promising natural- based scaffold for further discovering and developing improved crop- protection agents. (c) 2017 Elsevier Masson SAS. All rights reserved.
Rh-catalyzed intramolecular debenzylative cyclization of amines. Butyrolactams from benzylamines having a chloroacetylene moiety
摘要:
When benzylamines having a chloroacetylene moiety were heated in wet toluene with a catalytic amount of rhodium trifluoroacetate dimer, intramolecular debenzylative cyclization took place to give butyrolactams. This method is a new entry to selective debenzylation of amines. (C) 2011 Elsevier Ltd. All rights reserved.
An unprecedented efficient method for the reductive amination of carbonyl derivatives with ω-amino fatty acids under hydrosilylation conditions was developed leading to the corresponding lactams. A variety of pyrrolidinones, piperidinones, 2-azepanones were prepared in up to 95 % isolated yields (29 examples).
Iridium-Catalyzed Single-Step <i>N</i>-Substituted Lactam Synthesis from Lactones and Amines
作者:Kicheol Kim、Soon Hyeok Hong
DOI:10.1021/acs.joc.5b00101
日期:2015.4.17
Catalytic lactam synthesis was achieved directly from lactones and amines using an Ir catalyst. Three sequential transformations—aminolysis of lactone, N-alkylation of amine with hydroxyamide, and intramolecular transamidation of aminoamide—afforded the corresponding N-substituted lactams.
[EN] NICOTINAMIDE DERIVATIVES<br/>[FR] DÉRIVÉS DE NICOTINAMIDE
申请人:PFIZER LTD
公开号:WO2009153721A1
公开(公告)日:2009-12-23
The present invention relates to compounds of the formula (I) and pharmaceutically acceptable salts and solvates thereof, wherein the substituents are defined herein, to compositions containing such compounds and to the uses of such compounds for the treatment of allergic and respiratory conditions.
MULTISUBSTITUTED AROMATIC COMPOUNDS AS SERINE PROTEASE INHIBITORS
申请人:VERSEON CORPORATION
公开号:US20160024047A1
公开(公告)日:2016-01-28
There are provided inter alia multisubstituted aromatic compounds useful for the inhibition of kallikrein, which compounds include substituted pyrazolyl or substituted triazolyl. There are additionally provided pharmaceutical compositions. There are additionally provided methods of treating and preventing certain diseases or disorders, which disease or disorder is amenable to treatment or prevention by the inhibition of kallikrein.
Multisubstituted aromatic compounds as serine protease inhibitors
申请人:VERSEON CORPORATION
公开号:US10058541B2
公开(公告)日:2018-08-28
There are provided inter alia multisubstituted aromatic compounds useful for the inhibition of kallikrein, which compounds include substituted pyrazolyl or substituted triazolyl. There are additionally provided pharmaceutical compositions. There are additionally provided methods of treating and preventing certain diseases or disorders, which disease or disorder is amenable to treatment or prevention by the inhibition of kallikrein.