Substituent Effects on Aryltrifluoroborate Solvolysis in Water: Implications for Suzuki−Miyaura Coupling and the Design of Stable 18F-Labeled Aryltrifluoroborates for Use in PET Imaging
摘要:
Whereas electron withdrawing substituents retard the rate of aryltrifluoroborate solvolysis, electron-donating groups enhance it. Herein is presented a Hammett analysis of the solvolytic lability of aryltrifluoroborates where log(k(solv)) values correlate to sigma values with a rho value of approximately -1. This work provides a predictable rubric for tuning the reactivity of boron for several uses including F-18-labeled PET reagents and has mechanistic implications for ArBF3-enhanced ligandless metal-mediated cross coupling reactions with aryltrifluoroborates.
[EN] SUBSTITUTED CYCLOHEXYL COMPOUNDS AS NOP INHIBITORS<br/>[FR] COMPOSÉS DE CYCLOHEXYLE SUBSTITUÉS UTILISÉS EN TANT QU'INHIBITEURS DE NOP
申请人:DART NEUROSCIENCE LLC
公开号:WO2019168866A1
公开(公告)日:2019-09-06
Substituted cyclohexyl chemical entities of Formula (I): wherein Ra, G, and Rb have any of the values described herein, and compositions comprising such chemical entities; methods of making them; and their use in a wide range of methods, including metabolic and reaction kinetic studies; detection and imaging techniques; radioactive therapies; modulating and treating disorders mediated by nociceptin activity or dopamine signaling; treating neurological disorders, neurodegenerative diseases, depression, and schizophrenia; enhancing the efficiency of cognitive and motor training; and treating peripheral disorders, including renal, respiratory, gastrointestinal, liver, genitourinary, metabolic, and inflammatory disorders.
[Object] An excellent agent for preventing or treating dementia, schizophrenia, and the like, based on serotonin 5-HT
5A
receptor modulating action, is provided.
[Means for Solution] It was confirmed that acylguanidine derivatives (the following formula I; any one of Z
1
, Z
2
, Z
3
, Z
4
and Z
5
is nitrogen atom, and the others are carbon atoms) which have the characteristic structure in which the guanidine is bonded to one ring of the quinoline or isoquinoline via a carbonyl group, and a cyclic group is bonded to the other ring, exhibit potent 5-HT
5A
receptor modulating actions and excellent pharmacological actions based on the 5-HT
5A
receptor modulating action, and thus can be excellent agents for preventing or treating dementia, schizophrenia, bipolar disorder, or attention deficit hyperactivity disorder. Thus, the present invention has been completed.
An “On-Cycle” Precatalyst Enables Room-Temperature Polyfluoroarylation Using Sensitive Boronic Acids
作者:Liye Chen、Haydn Francis、Brad P. Carrow
DOI:10.1021/acscatal.8b00341
日期:2018.4.6
fluorinated arylboronic acid building blocks in cross-coupling has remained challenging, because of their acute base sensitivity. We report a general solution to this problem using a true catalytic intermediate, Pd(PAd3)(p-FC6H4)Br, as a uniquely effective “on-cycle” precatalyst that allows Suzuki–Miyaura coupling to occur much faster than even the most severe protodeboronation side reactions. Control of boron
交叉偶联中使用氟化芳基硼酸结构单元仍然具有挑战性,因为它们具有敏锐的碱敏感性。我们报告了使用真正的催化中间体Pd(PAd 3)(p -FC 6 H 4)Br作为唯一有效的“循环”预催化剂,可以使Suzuki-Miyaura偶联发生的速度快得多的一般解决方案。即使是最严重的原去硼副反应。还发现控制活性酸形式和休眠酯形式之间的硼形态在平衡催化速率与试剂分解之间起着至关重要的作用。该方法与任何氟化模式,对碱不稳定的官能团以及一系列溴(杂)芳烃均兼容。
Mechanistic Insights into C(sp
<sup>2</sup>
)−C(sp)N Reductive Elimination from Gold(III) Cyanide Complexes
作者:Alexandre Genoux、Jorge A. González、Estíbaliz Merino、Cristina Nevado
DOI:10.1002/anie.202005731
日期:2020.10.5
elimination for the overall C(sp2)−C(sp)Nbond forming reaction is characterized herein, for the first time, complementing previous studies reported for C(sp3)−C(sp3), C(sp2)−C(sp2), and C(sp3)−C(sp2) bondformation processes taking place on gold(III) species.
已制备了新的膦连接的二氰基芳基金(III)配合物家族,并已详细研究了它们对还原消除的反应性。激活的高度正熵和主要的12/13 C KIE都表明后期的过渡过渡态,而Hammett分析和DFT计算表明该过程是异步的。结果,本文首次表征了涉及整个C(sp 2)-C(sp)N键形成反应的异步协同还原消除的独特机制,是对先前报道的C(sp 3)-研究的补充C(sp 3),C(sp 2)-C(sp 2)和C(sp 3)-C(sp 2)在金(III)物种上发生的键形成过程。
Palladium-Catalyzed Solid-State Polyfluoroarylation of Aryl Halides Using Mechanochemistry
作者:Rikuro Takahashi、Tamae Seo、Koji Kubota、Hajime Ito
DOI:10.1021/acscatal.1c03731
日期:2021.12.17
products. Here, we show that solid-state high-temperature ball-milling conditions facilitate a palladium-catalyzed cross-coupling with polyfluorinated arylboronic acids and pinacol esters employing a simple catalytic system in the absence of any stoichiometric additives. This reaction exhibits a broad substrate scope and can be carried out in air, and the use of large amounts of dry and degassed organic solvents