A novel series of chromene-based TNF-alpha inhibitors is described. These chromene derivatives inhibit bacterial lipopolysaccharide (LPS) stimulated production of TNF-alpha from human peripheral blood mononuclear cells (PBMC). Additionally, these compounds inhibit NF-kB mediated transcription activation. (C) 2003 Elsevier Ltd. All rights reserved.
Construction of trisubstituted chromone skeletons carrying electron-withdrawing groups via PhIO-mediated dehydrogenation and its application to the synthesis of frutinone A
作者:Qiao Li、Chen Zhuang、Donghua Wang、Wei Zhang、Rongxuan Jia、Fengxia Sun、Yilin Zhang、Yunfei Du
DOI:10.3762/bjoc.15.291
日期:——
The construction of the biologically interesting chromone skeleton was realized by PhIO-mediated dehydrogenation of chromanones under mild conditions. Interestingly, this method also found application in the synthesis of the naturally occurring frutinone A.
Asymmetric Transfer Hydrogenation of 2,3-Disubstituted Flavanones through Dynamic Kinetic Resolution Enabled by Retro-Oxa-Michael Addition: Construction of Three Contiguous Stereogenic Centers
A ruthenium-catalyzed asymmetric transfer hydrogenation of 2,3-disubstituted flavanones was developed for the construction of three contiguous stereocenters under basic conditions through a combination of dynamic kinetic resolution and retro-oxa-Michael addition, giving chiral flavanols with excellent enantioselectivities and diastereoselectivities. The reaction proceeded via a base-catalyzed retro-oxa-Michael