Scalable and safe synthetic organic electroreduction inspired by Li-ion battery chemistry
作者:Byron K. Peters、Kevin X. Rodriguez、Solomon H. Reisberg、Sebastian B. Beil、David P. Hickey、Yu Kawamata、Michael Collins、Jeremy Starr、Longrui Chen、Sagar Udyavara、Kevin Klunder、Timothy J. Gorey、Scott L. Anderson、Matthew Neurock、Shelley D. Minteer、Phil S. Baran
DOI:10.1126/science.aav5606
日期:2019.2.22
Scaled-up sodium-free Birchreductions The so-called Birchreduction is frequently used by chemists despite its daunting conditions: Pyrophoric sodium is dissolved in pure liquified ammonia to achieve partial reduction of aromatics. Peters et al. surveyed and then optimized small-scale electrochemical alternatives to devise a safer protocol that can work on a larger scale with a broad range of functionally
Organocatalyzed Birch Reduction Driven by Visible Light
作者:Justin P. Cole、Dian-Feng Chen、Max Kudisch、Ryan M. Pearson、Chern-Hooi Lim、Garret M. Miyake
DOI:10.1021/jacs.0c05899
日期:2020.8.5
The Birchreduction is a powerful synthetic methodology that uses solvated electrons to convert inert arenes to 1,4-cyclohexadienes-valuable intermediates for building molecular complexity. Birchreductions traditionally employ alkali metals dissolved in ammonia to produce a solvated electrons for the reduction of unactivated arenes such as benzene (Ered < -3.42 V vs. SCE). Photoredox catalysts have
Birch 还原是一种强大的合成方法,它使用溶剂化电子将惰性芳烃转化为 1,4-环己二烯有价值的中间体,以构建分子复杂性。桦木还原传统上使用溶解在氨中的碱金属来产生溶剂化电子,用于还原未活化的芳烃,例如苯(Ered < -3.42 V vs. SCE)。光氧化还原催化剂在高度还原应用中越来越受欢迎,但没有报道显示出足以减少苯的还原潜力。在这里,我们引入苯并苝酰亚胺作为新型有机光氧化还原催化剂,用于在环境温度下进行桦木还原,并由市售 LED 的可见光驱动。使用低催化剂负载量(<1 摩尔百分比),在完全无金属的反应中,苯和其他官能化芳烃以中等至良好的产率选择性地转化为 1,4-环己二烯。机理研究表明,这种前所未有的可见光诱导反应是通过有机光氧化还原催化剂利用两个可见光光子的能量影响单个高能化学转化的能力实现的。
An alternative route to tethered Ru(II) transfer hydrogenation catalysts
A new route towards a series of tethered η6-arene/Ru(II) catalysts for use in the transfer and pressure hydrogenation of ketones and aldehydes to alcohols is reported. The route proceeds through the formation of an amide from the diamine precursor, followed by reduction, rather than the direct alkylation of the diamine. This has the advantage that dialkylation of the amine is avoided during the synthesis
Osmium(<scp>ii</scp>) tethered half-sandwich complexes: pH-dependent aqueous speciation and transfer hydrogenation in cells
作者:Sonia Infante-Tadeo、Vanessa Rodríguez-Fanjul、Abraha Habtemariam、Ana M. Pizarro
DOI:10.1039/d1sc01939b
日期:——
formation by attachment of the pendant alcohol–oxygen to the osmium centre, resulting in the alkoxy tethered complex [Os(η6-arene-O-κ1)(XY)]n+. Complexes 1C–13C of formula [Os(η6:κ1-C6H5(CH2)3OH/O)(XY)]+ are fully characterised, including the X-ray structure of cation 3C. Tether-ring formation is reversible and pH dependent. Osmiumcomplexes bearing picolinate N,O-chelates (9–12) catalyse the hydrogenation
水化通常被认为是细胞内金属药物活性的必要步骤。半不稳定配体可用于可逆金属药物活化。我们报道了一个新的锇( II )芳烃配合物家族,其分子式为 [Os(η 6 -C 6 H 5 (CH 2 ) 3 OH)(XY)Cl] +/0 ( 1–13 ) ,带有半稳定态 η 6 -结合芳烃 3-苯基丙醇,其中 XY 是中性 N,N 或阴离子 N,O -二齿螯合配体。 Os-Cl 键在水中断裂导致羟基/水加合物 Os-OH(H) 的形成。尽管被认为是惰性的,但羟基加合物意外地通过将侧醇-氧附着到锇中心而引发快速系链环形成,从而形成烷氧基系链络合物[Os(η 6 -芳烃- O -κ 1 )(XY )] n + .式 [Os(η 6 :κ 1 -C 6 H 5 (CH 2 ) 3 OH/O)(XY)] +的配合物1C–13C得到了充分表征,包括阳离子3C的 X 射线结构。系链环的形成是可逆的并且依赖于pH值。
Non-Cryogenic, Ammonia-Free Reduction of Aryl Compounds
申请人:University of Pittsburgh - Of the Commonwealth System of Higher Education
公开号:US20220089508A1
公开(公告)日:2022-03-24
A method of reducing an aromatic ring or a cyclic, allylic ether in a compound includes preparing a reaction mixture including a compound including an aromatic moiety or a cyclic, allylic ether moiety, an alkali metal, and either ethylenediamine, diethylenetriamine, triethylenetetramine, or a combination thereof, in an ether solvent; and reacting the reaction mixture at from −20° C. to 30° C. for a time sufficient to reduce a double bond in the aromatic moiety to a single bond or to reduce the cyclic, allylic ether moiety.