Copper-Catalyzed Vinylogous Aerobic Oxidation of Unsaturated Compounds with Air
作者:Hai-Jun Zhang、Alexander W. Schuppe、Shi-Tao Pan、Jin-Xiang Chen、Bo-Ran Wang、Timothy R. Newhouse、Liang Yin
DOI:10.1021/jacs.8b01886
日期:2018.4.18
A mild and operationally simple copper-catalyzed vinylogous aerobic oxidation of β,γ- and α,β-unsaturated esters is described. This method features good yields, broad substrate scope, excellent chemo- and regioselectivity, and good functional group tolerance. This method is additionally capable of oxidizing β,γ- and α,β-unsaturated aldehydes, ketones, amides, nitriles, and sulfones. Furthermore, the
描述了一种温和且操作简单的铜催化乙烯基有氧氧化 β,γ-和 α,β-不饱和酯。该方法具有收率好、底物范围广、化学选择性和区域选择性好、官能团耐受性好等特点。该方法还能够氧化β,γ-和α,β-不饱和醛、酮、酰胺、腈和砜。此外,本催化体系适用于双乙烯基和三乙烯基氧化。发现四甲基胍 (TMG) 作为碱的作用至关重要,但我们也推测它可以作为三氟甲磺酸铜 (II) 的配体来生产活性铜 (II) 催化剂。进行的机械实验表明,通过烯丙基铜 (II) 物质存在一个合理的反应途径。最后,
Pummerer Cyclization Revisited: Unraveling of Acyl Oxonium Ion and Vinyl Sulfide Pathways
作者:Xin Li、Rich G. Carter
DOI:10.1021/acs.orglett.8b02059
日期:2018.9.21
Two viable pathways (vinyl sulfide and acyl oxoniumion) for the Pummerer cyclization have been unraveled that expand the reaction scope and capabilities. Use of Brønsted-enhanced Lewis acidity was key to realization of the vinyl sulfide pathway, whereas selective complexation of the sulfur lone pair facilitated the unprecedented acyl oxoniumion pathway. Preliminary mechanistic investigations support
The first nickel-catalyzed desymmetric hydrogenation has been achieved. With the Ni(OTf)2/(S,S)-Ph-BPE system, a series of γ,γ-disubstituted cyclohexadienones were transformed to the corresponding cyclohexenones with a chiral all-carbon quaternary center at the γ position in high yields (92% to 98%) and excellent enantioselectivities (92% to 99% ee). This catalytic system can also tolerate the desymmetric
首次实现了镍催化的不对称氢化。使用 Ni(OTf)2/(S,S)-Ph-BPE 系统,一系列 γ,γ-二取代环己二烯酮以高产率转化为相应的环己烯酮,其在 γ 位具有手性全碳四元中心( 92% 至 98%)和出色的对映选择性(92% 至 99% ee)。该催化体系还可以耐受螺碳环环己二烯酮的去对称反应,以产生相应的带有手性螺季碳的环己烯酮,收率高(94% 至 98%)和 ee 值(96% 至 99% ee)。此外,该方法为天然产物大麻吡酮 A 和 B 的中间体提供了一种高效、简洁的合成路线。
Design and Synthesis of Thiadiazoles and Thiazoles Targeting the Bcr-Abl T315I Mutant: from Docking False Positives to ATP-Noncompetitive Inhibitors
previously identified dual Src/Abl hits, a new series of 1,3,4‐thiadiazoles and 1,3‐thiazoles were designed and synthesized, paying particular attention to the reduction of their lipophilicity and to the improvement of the affinity towards the drug‐resistant T315Imutant. Compound 5 was identified as a promising allosteric inhibitor of the T315Imutant.
FeCl3 catalyzed intermolecular reaction between enol ethers and anilines: Access to 2,3-substituted indoles through aryl group migration
作者:Tapan Kumar Jena、Faiz Ahmed Khan
DOI:10.1016/j.tetlet.2020.152583
日期:2020.12
An intermolecular FeCl3 catalyzed reaction between anilines and enol ethers is described. A variety of enol ethers and aromatic amines undergo a CC bond formation followed by cyclization via CN bond formation to afford the 2,3-disubstituted indoles, involving an unexpected aryl group migration. In this methodology, anilines act as bis-nucleophiles, wherein the initial attack occurs at the α-position