An Opportunity for Mg-Catalyzed Grignard-Type Reactions: Direct Coupling of Benzylic Halides with Pinacolborane with 10 mol % of Magnesium
作者:Christine Pintaric、Sandra Olivero、Yves Gimbert、Pierre Y. Chavant、Elisabet Duñach
DOI:10.1021/ja1052973
日期:2010.9.1
Mg in catalytic amounts as the only metal permits the reductive coupling between benzyl halides and pinacolborane. HBpin acts both as an electrophile and as a reducing agent to regenerate an organomagnesium species in situ. An hydride oxidation mechanism is proposed on the basis of DFT calculations.
Photoinduced
<scp>NaI‐Promoted</scp>
Radical Borylation of Alkyl Halides and Pseudohalides
作者:Chenglan Wang、Lu Zhou、Kai Yang、Feng Zhang、Qiuling Song
DOI:10.1002/cjoc.202100115
日期:2021.7
A method for photoinduced NaI-promoted radical borylation of aliphatic halides and pseudohalides with bis(catecholato)diboron (B2cat2) as the boron source is introduced. The borylation reaction is operationally simple and shows high functional group tolerance and broad substrate scope. Preliminary mechanistic studies suggest that the reaction proceeds through SN2-based radical-generation strategy.
介绍了一种以双(儿茶酚)二硼(B 2 cat 2 )为硼源的光诱导NaI促进的脂肪族卤化物和拟卤化物自由基硼化的方法。硼酸化反应操作简单,显示出高官能团耐受性和广泛的底物范围。初步机理研究表明,该反应通过基于S N 2 的自由基生成策略进行。
Synthesis and SAR study of pyrrolo[3,4-b]pyridin-7(6H)-one derivatives as melanin concentrating hormone receptor 1 (MCH-R1) antagonists
作者:Chae Jo Lim、Ji Young Kim、Byung Ho Lee、Kwang-Seok Oh、Kyu Yang Yi
DOI:10.1016/j.bmcl.2013.01.053
日期:2013.3
The discovery and optimization of novel pyrrolo[3,4-b]pyridin-7(6H)-one MCH-R1 antagonists are described. A systematic SAR study probing the effects of aryl-, benzyl- and arylthio-substituents at the 2-position of the pyrrolo[3,4-b]pyridin-7(6H)-ones led to identification of the 2-[(4-fluorophenyl)thio] derivative 7b as a highly potent MCH-R1 antagonist. This compound also has favorable pharmacokinetic
描述了新型吡咯并[3,4- b ]吡啶-7(6 H)-1 MCH-R1拮抗剂的发现和优化。一项系统的SAR研究探索了吡咯并[3,4- b ]吡啶7-7 (6 H)-1的2位上的芳基,苄基和芳硫基取代基的作用,从而鉴定了2-[(( 4-氟苯基)硫基]衍生物7b作为高效的MCH-R1拮抗剂。该化合物还具有良好的药代动力学特性,具有较高的代谢稳定性,并且对CYP亚型和hERG的影响最小。
Metal-Free Direct Deoxygenative Borylation of Aldehydes and Ketones
作者:Jianbin Li、Haining Wang、Zihang Qiu、Chia-Yu Huang、Chao-Jun Li
DOI:10.1021/jacs.0c03813
日期:2020.7.29
Direct conversion of aldehydes and ketones into alkylboronic esters via deoxygenative borylation represents an unknown yet highly desirable transformation. Herein, we present a one-step and metal-free method for carbonyl deoxy-borylation under mild conditions. A wide range of aromatic aldehydes and ketones are tolerated and successfully converted into the corresponding benzylboronates. By the same
efficient heterogeneous catalyst for the selective borylation of benzylicC(sp3)–H bonds of alkylarenes including secondary derivatives, using pinacolborane as the borylating agent. A thorough physicochemical analysis reveals that in situ reduced ultrasmall Ni species on CeO2 during the reaction are the actual active species responsible for the borylation.