Investigation of the substituent specific cross-interaction effects on <sup>13</sup>
C NMR of the CN bridging group in substituted benzylidene anilines
作者:Chenzhong Cao、Bingtao Lu、Guanfan Chen
DOI:10.1002/poc.1760
日期:2011.4
The substituent effect on 13C NMR of the CN in benzylidene anilines XPhCHNPhY was investigated, in which the substituents X and Y are in p‐position or in m‐position of the two aromatic rings. The substituenteffects including the inductive effects of X and Y, the conjugative effects of X and Y, and the substituent specific cross‐interaction effect were put into one model to quantify the 13C NMR chemical
Photoredox Radical/Polar Crossover Enables Construction of Saturated Nitrogen Heterocycles
作者:Loïc R. E. Pantaine、John A. Milligan、Jennifer K. Matsui、Christopher B. Kelly、Gary A. Molander
DOI:10.1021/acs.orglett.9b00602
日期:2019.4.5
Photoredox-mediated radical/polar crossover (RPC) processes offer new avenues for the synthesis of cyclic molecules. This process has been realized for the construction of medium-sized saturated nitrogen heterocycles. Photocatalytically generated alkylradicals possessing pendant leaving groups engage imines in C–C bond formation, and subsequent reduction of the intermediate nitrogen-centered radical triggers
Discovery of a benzenesulfonamide-based dual inhibitor of microsomal prostaglandin E2 synthase-1 and 5-lipoxygenase that favorably modulates lipid mediator biosynthesis in inflammation
Leukotrienes (LTs) and prostaglandin (PG)E-2, produced by 5-lipoxygenase (5-LO) and microsomal prostaglandin E-2 synthase-1 (mPGES-1), respectively, are key players in inflammation, and pharmacological suppression of these lipid mediators (LM) represents a strategy to intervene with inflammatory disorders. Previous studies revealed that the benzenesulfonamide scaffold displays efficient 5-LO-inhibitory properties. Here, we structurally optimized benzenesulfonamides which led to an N-phenyl-benzenesulfonamide derivative (compound 47) with potent inhibitory activities (IC50 = 2.3 and 0.4 mu M for isolated 5-LO and 5-LO in intact cells, respectively). Compound 47 prevented the interaction of 5-LO with its activating protein (FLAP) at the nuclear envelope in transfected HEK293 cells as shown by in situ proximity ligation assay. Comprehensive assessment of the LM profile produced by human macrophages revealed the ability of 47 to selectively down-regulate pro-inflammatory LMs (i.e. LTs and PGE(2)) in M1 but to enhance the formation of pro-resolving LMs (i.e. resolvins and maresins) in M2 macrophages. Moreover, 47 strongly inhibited LT formation and cell infiltration in two in vivo models of acute inflammation (i.e., peritonitis and air pouch sterile inflammation in mice). Together, 47 represents a novel LT biosynthesis inhibitor with an attractive pharmacological profile as anti-inflammatory drug that also promotes the biosynthesis of pro-resolving LM. (C) 2018 Elsevier Masson SAS. All rights reserved.