在碘化铜(CuI)存在下,以分子碘(I 2)为唯一氧化剂,进行了N-芳基烯胺的分子内C–H官能化反应。本文所述的高效且通用的合成方法与N-杂芳基和N-芳基取代的烯胺兼容,并通过I 2生成各种咪唑并[1,2- a ]吡啶和吲哚衍生物介导的氧化性C–N和C–C键的形成。这种无配体的C–H官能化方法也可以与粗制烯胺一起使用,这可以直接从芳胺和酮(或炔烃)直接合成产物,而无需纯化烯胺中间体。
为环外β-烯胺酮的分子内环化一个高效和灵活的协议已经公开了carbazolones和咪唑并[1,2的合成一个]吡啶通过高价碘促进的抗衡阴离子控制自由基机理(III) 。HTIB和AgSbF 6的协同行为在通过CC和CN键形成所需的分子内环化过程中起着至关重要的作用。机械学的见解表明,系统中涉及的两个竞争性反应是由抗衡阴离子的性质决定的,抗衡阴离子的性质决定了最终产物的形成。制备并分离了各种咔唑酮和咪唑并[1,2- a ]吡啶分子,收率良好至极佳。
Intermolecular Multiple Dehydrogenative Cross‐Couplings of Ketones with Boronic Acids and Amines via Copper Catalysis
作者:Tianzhang Wang、Guowei Chen、Yu‐Jing Lu、Qian Chen、Yanping Huo、Xianwei Li
DOI:10.1002/adsc.201900419
日期:2019.8.21
versatile oxidative coupling reaction was developed for the synthesis of valuable β‐functionalized unsaturatedketones and meta‐substituted phenols. In the case of intramolecular reactions, achieving rapid molecular complexity through multiple dehydrogenative couplings is already a well‐established strategy. Herein, we report an intermolecular multiple dehydrogenative coupling between ketones and nucleophilic
Synthesis, spectral and structural characterization of cobalt(III) dithiocarbamato complexes: Catalytic application for the solvent free enamination reaction
using 1–2 mol% of the above cobalt(III) complexes as catalysts and these have been characterized by NMR, GC–MS and X-ray crystallography. Complexes 1, 2 and 3 are stabilized by intermolecular C–H⋯S interactions, leading to the formation of supramolecular architectures. Thermogravimetric analysis of complexes 1 and 2 have been investigated by TG-DTA, which indicate that cobalt sulfide is formed as the
Palladium-Catalyzed Cyclocarbonylation of Pyridinylated Vinylogous Amides and Ureas to Generate Ring-Fused Pyridopyrimidinones
作者:Gang Yan、Jennifer E. Golden
DOI:10.1021/acs.orglett.8b01275
日期:2018.8.3
1-b]quinazoline-1,11(2H)-diones and 2,3-dihydropyrido[1,2-a]pyrrolo[3,4-d]pyrimidine-1,10-diones was generated via a palladium-catalyzed, pyridine-directed, cyclocarbonylation of 2-pyridyl-linked vinylogous amides and ureas in yields of up to 90%.
作为旨在产生用于药物化学探索的新杂环框架的计划的一部分,采取了一种有效的方法来组装新型环稠合的嘧啶并嘧啶酮。具体而言,收集了11 H-吡啶并[ 2,1 - b ]喹唑啉-1,11 (2 H)-二酮和2,3-二氢吡啶并[ 1,2- a ]吡咯并[3,4- d ]嘧啶-通过钯催化的2-吡啶基连接的乙烯基酰胺和脲的钯催化,吡啶定向的环羰基化反应生成1,10-二酮,收率高达90%。
Fe-Catalyzed enaminone synthesis from ketones and amines
We have developed an iron-catalyzed direct olefination for enaminone synthesis, with saturated ketones as a source of olefins. This direct ketone β-functionalization reaction has readily available starting materials and a wide range of substrates and requires mild reaction conditions.
The synthesis of 6,7,8,9-tetrahydro-5H-pyrido[2,3-b]indol-9-ones from arylenaminones is described. Two “routes” have been investigated: a radical process through a photochemical reaction, and a catalytic process through an arylpalladium complex.
描述了由芳亚胺酮合成6,7,8,9-四氢-5 H-吡啶并[2,3 - b ]吲哚-9-酮。已经研究了两种“途径”:通过光化学反应的自由基过程和通过芳基钯络合物的催化过程。