Modular Cyclopentenone Synthesis through the Catalytic Molecular Shuffling of Unsaturated Acid Chlorides and Alkynes
作者:Yong Ho Lee、Elliott H. Denton、Bill Morandi
DOI:10.1021/jacs.0c10832
日期:2020.12.16
general strategy for the intermolecular synthesis of polysubstituted cyclopentenones using palladium catalysis. Overall, this reaction is achieved via a molecular shuffling process involving an alkyne, an α,β-unsaturated acid chloride, which serves as both the alkene and carbon monoxide source, and a hydrosilane to create three new C-C bonds. This newcarbon monoxide-free pathway delivers the products
我们描述了使用钯催化分子间合成多取代环戊烯酮的一般策略。总体而言,该反应是通过涉及炔烃、α,β-不饱和酰氯(作为烯烃和一氧化碳来源)和氢硅烷的分子改组过程实现的,以产生三个新的 CC 键。这种新的无一氧化碳途径提供了具有优异产量的产品。此外,区域选择性是对环戊烯酮合成常规方法的补充。此外,还提出了一组区域和化学发散反应,以强调这种新策略的合成潜力。
A Novel Synthesis of Esters via Substitution of the Benzotriazolyl Group in 1-(Benzotriazol-1-yl)alkyl Esters with Organozinc Reagents
作者:Alan R. Katritzky、Stanislaw Rachwal、Bogumila Rachwal
DOI:10.1055/s-1991-26382
日期:——
Aldehydes are converted by thionyl chloride and benzotriazole into 1-(1-chloroalkyl)benzotriazoles which react with sodium carboxylates to give 1-(benzotriazol-1-yl)alkyl esters 3. In an alternative route, 3 are prepared by substitution of one of the acetoxy groups in acylals with benzotriazole. The benzotriazolyl moiety in 3 is substituted by an alkyl, an aryl or an alkynyl group upon treatment with an organozinc reagent in a new versatile synthesis of esters 4.
Here we reported the iridium-catalyzed hydrosilylation of internalalkynes under simple and mild conditions. The intrinsic functional groups of alkyne substrates were disclosed to be crucial in facilitating both the hydrosilylation process and related regioselectivity owing to their coordination capability towards the iridium catalyst. Utilization of the steric trimethylsilyl-protected trihydroxysilane
Some Formaldehyde Derivatives of Acetylenic Hydrocarbons<sup>1</sup>
作者:G. F. Hennion、E. P. Bell
DOI:10.1021/ja01250a017
日期:1943.10
Palladium-catalysed carboformylation of alkynes using acid chlorides as a dual carbon monoxide and carbon source
作者:Yong Ho Lee、Elliott H. Denton、Bill Morandi
DOI:10.1038/s41557-020-00621-x
日期:2021.2
Hydroformylation, a reaction that installs both a C–H bond and an aldehyde group across an unsaturated substrate, is one of the most important catalytic reactions in both industry and academia. Given the synthetic importance of creating new C–C bonds, the development of carboformylation reactions, wherein a new C–C bond is formed instead of a C–H bond, would bear enormous synthetic potential to rapidly
加氢甲酰化是一种在不饱和底物上同时安装 C-H 键和醛基的反应,是工业界和学术界最重要的催化反应之一。鉴于创造新的 C-C 键的合成重要性,发展碳甲酰化反应,其中形成新的 C-C 键而不是 C-H 键,将具有巨大的合成潜力,可以在有价值的合成中迅速增加分子的复杂性醛类。然而,利用外源 CO 源的四组分反应固有的苛刻复杂性使得直接碳甲酰化反应的发展成为一项艰巨的挑战。在这里,我们描述了一种钯催化策略,该策略使用现成的芳酰氯作为碳亲电试剂和 CO 源,与空间拥挤的氢硅烷串联,进行炔烃的立体选择性碳甲酰化。将该协议扩展到四种化学发散性羰基化,进一步突出了该策略在羰基化化学中提供的创造性机会。