Pd-Catalyzed C–H Carbonylation of (Hetero)arenes with Formates and Intramolecular Dehydrogenative Coupling: A Shortcut to Indolo[3,2-c]coumarins
摘要:
An efficient protocol for the synthesis of (hetero)aryl carboxylic esters has been achieved by Pd-catalyzed CH carbonylation of (hetero)arenes with aryl formates. A relatively wide range of functional groups can be tolerated in this transformation, and the corresponding esters are obtained in good yields. On this basis, an intramolecular oxidative CH/CH coupling has been developed to prepare indolo[3,2-c]coumarins.
The formyloxyl radical: electrophilicity, C–H bond activation and anti-Markovnikov selectivity in the oxidation of aliphatic alkenes
作者:Miriam Somekh、Mark A. Iron、Alexander M. Khenkin、Ronny Neumann
DOI:10.1039/d0sc04936k
日期:——
outer-sphere electrontransfer between the formyloxyl radical donor and the [CoIIIW12O40]5− polyanion acceptor forming a donor–acceptor [D+–A−] complex is proposed to induce the observed anti-Markovnikov selectivity. Finally, the overall reactivity of HC(O)O˙ towards hydrogen abstraction was evaluated using additional substrates. Alkanes were only slightly reactive, while the reactions of alkylarenes
过去,很少通过实验观察到甲酰氧基自由基HC(O)O 3,这些研究是在电子结构的背景下进行的理论光谱分析。缺乏方便的制备甲酰氧基自由基的方法,使得人们无法研究其对有机底物的反应性。最近,我们发现在甲酸/甲酸锂的阳极电化学氧化中形成了HC(O)O 3。使用[Co III W 12 O 40 ] 5-聚阴离子催化剂,可导致由苯形成甲酸苯酯。在这里,我们介绍我们对电化学原位反应性的研究用有机底物生成HC(O)O 3。根据实验和计算得出的哈米特线性自由能关系,与苯的反应和选择的取代衍生物表明,HC(O)O 3是亲电子的。HC(O)O 3与末端烯烃的反应明显有利于抗马尔可夫尼科夫氧化反应,产生相应的醛作为主要产物以及进一步的氧化产物。以1-己烯为代表的底物进行的可能的反应路径分析,有利于从烯丙基C–H键中抽出氢形成己烯丙基的可能性,然后强烈建议在C1位置进一步进攻第二个HC(O)O˙自由基。据推测,进一步的氧化产物主要是由于HC(O)O
LXR AGONISTS AND USES THEREOF
申请人:Martinez Eduardo J.
公开号:US20170066791A1
公开(公告)日:2017-03-09
This invention features compounds that modulate the activity of liver X receptors, pharmaceutical compositions including the compounds of the invention, and methods of utilizing those compositions for modulating the activity of liver X receptors in the treatment of cancer.
[EN] INHIBITORS OF CREATINE TRANSPORT AND USES THEREOF<br/>[FR] INHIBITEURS DE TRANSPORT DE LA CRÉATINE ET LEURS UTILISATIONS
申请人:RGENIX INC
公开号:WO2015168465A1
公开(公告)日:2015-11-05
This invention relates to compounds that inhibit creatine transport and/or creatine kinase, pharmaceutical compositions including such compounds, and methods of utilizing such compounds and compositions for the treatment of cancer.
Electrochemical Hydroxylation of Arenes Catalyzed by a Keggin Polyoxometalate with a Cobalt(IV) Heteroatom
作者:Alexander M. Khenkin、Miriam Somekh、Raanan Carmieli、Ronny Neumann
DOI:10.1002/anie.201801372
日期:2018.5.4
a catalyst and lithium formate as an electrolyte via formation of a formyloxyl radical as the reactive species, which was trapped by a BMPO spin trap and identified by EPR. Hydrogen was formed at the Pt cathode. The sum transformation is ArH+H2O→ArOH+H2. Non‐optimized reaction conditions showed a Faradaic efficiency of 75 % and selective formation of the mono‐oxidized product in a 35 % yield. Decomposition
芳烃(例如苯到苯酚)的可持续,选择性直接羟基化是一项重要的研究挑战。提出了使用甲酸氧化苯及其卤代衍生物以选择性地产生芳基甲酸酯的电催化转化,其易于被水水解以产生相应的苯酚。甲酰化反应在[Co III W 12 O 40 ] 5−作为催化剂和甲酸锂作为电解质的情况下,通过形成甲酰氧基作为反应性物质在Pt阳极上发生,该自由基被BMPO自旋阱捕获并由EPR确定。在Pt阴极上形成氢。总和为ArH + H 2 O→ArOH + H 2。未优化的反应条件显示出75%的法拉第效率和35%的收率选择性形成了单氧化产物。甲酸分解为CO 2和H 2是一种副反应。
[EN] LXR AGONISTS AND USES THEREOF<br/>[FR] AGONISTES DU RÉCEPTEUR X DU FOIE ET LEURS UTILISATIONS
申请人:RGENIX INC
公开号:WO2015106164A1
公开(公告)日:2015-07-16
This invention features compounds that modulate the activity of liver X receptors, pharmaceutical compositions including the compounds of the invention, and methods of utilizing those compositions for modulating the activity of liver X receptors in the treatment of cancer.