Traceless heterocycle synthesis based on transition-metal-catalyzed C-H functionalization is synthetically appealing but has been realized only in monodentate directing systems. Bidentate directing systems allow for the achievement of high catalytic reactivity without the need for a high-cost privileged ligand. The first bidentate directing-enabled, traceless heterocycle synthesis is demonstrated in the
[EN] COMPOUNDS AND METHODS FOR TREATING CANCER<br/>[FR] COMPOSÉS ET MÉTHODES DE TRAITEMENT DU CANCER
申请人:ACTAVALON INC
公开号:WO2018081612A1
公开(公告)日:2018-05-03
Substituted hydrazone compounds, methods of making such compounds and metal complexes thereof, pharmaceutical compositions and medicaments comprising such compounds, and methods of using such compounds and metal complexes to treat, prevent or ameliorate cancer are provided.
Traceless Bidentate Directing Group Assisted Cobalt-Catalyzed <i>sp</i><sup>2</sup>-C–H Activation and [4 + 2]-Annulation Reaction with 1,3-Diynes
作者:Arnab Dey、Chandra M. R. Volla
DOI:10.1021/acs.orglett.0c02664
日期:2020.10.2
cobalt-catalyzed [4 + 2] annulation of hydrazones and 1,3-diynes has been developed for the synthesis of 3-alkynylated isoquinolines engaging 2-aminopyridine as a traceless bidentate directinggroup. The strategy has been successfully extended for the synthesis of 3,3′-biisoquinoline moieties via both one-pot as well as sequential approaches. The utilization of a traceless bidentate directinggroup with an inexpensive
Cobalt-catalyzed highly diastereoselective [3 + 2] carboannulation reactions: facile access to substituted indane derivatives
作者:Arnab Dey、Anurag Singh、Chandra M. R. Volla
DOI:10.1039/d1cc05245d
日期:——
Efficient oxidative [3 + 2] annulation reaction involving aryl hydrazones and heterobicyclic alkenes has been realized with inexpensive and earth-abundant cobalt salts under aerobic conditions. The reaction proceeds via directing-group-assisted C–H activation and exo-selective migratory insertion, followed by the intramolecular nucleophilic attack of the alkylcobalt(III) species onto the imine with
Synthesis of Dicyanovinyl-Substituted 1-(2-Pyridyl)pyrazoles: Design of a Fluorescent Chemosensor for Selective Recognition of Cyanide
作者:Jessica Orrego-Hernández、Jaime Portilla
DOI:10.1021/acs.joc.7b02460
日期:2017.12.15
in 58–66% overall yield, by a three-step synthesis sequence starting from p-substituted acetophenones. The substituted p-methoxyphenyl showed good fluorescence emission and large Stokes shifts in different solvents due to its greater ICT. Likewise, this probe evidenced high selectivity and sensitivity and fast recognition for CN– with a detection limit of 6.8 μM. HRMS analysis, 1H NMR titration experiments
一种荧光“关断”探针被设计并成功地应用于检测氰化物(CN - )的基础上Michael型亲核加成反应和分子内电荷转移(ICT)机制。对于这项研究,已在58–66中合成了作为供体-π受体(D-π-A)系统的3-芳基-4-(2,2-二氰基乙烯基)-1-(2-吡啶基)吡唑家族从对位取代的苯乙酮开始的三步合成序列,得到总收率的%。取代的对甲氧基苯基由于其更大的ICT而在不同的溶剂中显示出良好的荧光发射和大的斯托克斯位移。同样,该探针证明了对CN的高选择性和灵敏度以及快速识别–检测限为6.8μM。HRMS分析,1进行了1 H NMR滴定实验和TD-DFT计算,以确认CN –化学光度计的检测机理和荧光性质。此外,荧光试纸可方便地用于检测水溶液中的氰化物。