New synthesis of 3-(β-D-glucopyranosyl)-5-substituted-1,2,4-triazoles, nanomolar inhibitors of glycogen phosphorylase
摘要:
O-Perbenzoylated 5-(beta-D-glucopyranosyl)tetrazole was reacted with N-benzyl carboximidoyl chlorides to give the corresponding 4-benzyl-3-(beta-D-glucopyranosyl)-5-substituted-1,2,4-triazoles. Removal of the O-benzoyl and N-benzyl protecting groups by base catalysed transesterification and catalytic hydrogenation, respectively, furnished a series of 3-(beta-D-glucopyranosyl)-5-substituted-1,2,4-triazoles with aliphatic, mono- and bicyclic aromatic, and heterocyclic substituents in the 5-position. Enzyme kinetic studies revealed these compounds to inhibit rabbit muscle glycogen phosphorylase b: best inhibitors were the 5-(4-aminophenyl)- (K-i 0.67 mu M) and the 5-(2-naphthyl)-substituted (K-i 0.41 mu M) derivatives. This study uncovered the C-glucopyranosyl-1,2,4-triazoles as a novel skeleton for nanomolar inhibition of glycogen phosphorylase. (C) 2014 Elsevier Masson SAS. All rights reserved.
Parallel Copper Catalysis: Diastereoselective Synthesis of Polyfunctionalized Azetidin-2-imines
作者:Yanpeng Xing、Hongyang Zhao、Qiongyi Shang、Jing Wang、Ping Lu、Yanguang Wang
DOI:10.1021/ol4010323
日期:2013.6.7
diastereoselective synthesis of highly functionalized azetidin-2-imines has been achieved through a parallel catalysis strategy, including a copper-catalyzed azide–alkyne cycloaddition, a copper-catalyzed Csp–Csp2 cross-coupling reaction, and an intermolecular [2 + 2] cycloaddition. The products could be conveniently converted into the structurally interesting dihydroazeto[1,2-a]benzo[e]azepin-2(4H)-imines
通过平行催化策略,包括铜催化的叠氮化物-炔烃环加成反应,铜催化的C sp -C sp 2交叉偶联反应和分子间反应,已经实现了高效且非对映选择性合成高度官能化的氮杂环丁烷-2-亚胺。[2 + 2]环加成。可以方便地将产物转化为结构上令人感兴趣的二氢氮杂[1,2- a ]苯并[ e ]氮杂-2-2 (4 H)-亚胺。
Tandem synthesis of 1-(alkylamino)-2,4-diarylpyrimido[6,1-a]isoquinolin-5-ium chlorides from isoquinoline, N-alkyl-benzimidoyl chlorides, and isocyanides
1-(Alkylamino)-2,4-diarylpyrimido[6,1-a]isoquinolin-5-ium chlorides are obtained in good yields via a tandem reaction between isoquinoline, N-alkyl-benzimidoyl chlorides and alkyl isocyanides in anhydrous acetonitrile.
通过在无水乙腈中异喹啉,N-烷基-苯甲酰氯和烷基异氰化物之间的串联反应,可以高收率获得1-(烷基氨基)-2,4-二芳基嘧啶[6,1- a ]异喹啉-5-鎓氯化物。
Nickel-catalyzed 1,4-aryl rearrangement of aryl <i>N</i>-benzylimidates <i>via</i> C–O and C–H bond cleavage
作者:Satoshi Ogawa、Mamoru Tobisu
DOI:10.1039/d2cc02355e
日期:——
We report herein that nickel-catalyzed reaction of aryl imidates bearing an N-benzyl group results in 1,4-migration of an O-aryl group via the cleavage of C–O and C–H bonds. This protocol allows for the benzylic C–H bond arylation of benzylamine building blocks using phenols as an aryl source to form elaborate diarylmethylamine derivatives.
[EN] GLYCOGEN PHOSPHORYLASE INHIBITORS<br/>[FR] INHIBITEURS DE PHOSPHORYLASE DE GLYCOGÈNE
申请人:DEBRECENI EGYETEM
公开号:WO2013061105A8
公开(公告)日:2013-09-19
Synthesis of 2-Azaanthracenes via a Sequential Sonogashira Coupling/Alkynyl Imine−Allenyl Imine Isomerization/Aza-Diels−Alder/Elimination−Aromatization Reaction
作者:Jian Cao、Xiongfa Yang、Xilin Hua、Yuan Deng、Guoqiao Lai
DOI:10.1021/ol1028207
日期:2011.2.4
An Interesting sequential Sonogashira coupling/alkynyl imine-allenyl imine isomerization/aza-Diels-Aider/elimination-aromatization reaction, providing a facile synthesis of substituted 2-azaanthracenes from 1,6-dlynes and imidoyl chlorides, is reported. The easy procedure accessing the products efficiently from readily available starting materials may imply a potential synthetic application.