2-苯基-5,6-二氢咪唑并[2,1-a]异喹啉 在
10% palladium on active carbon 作用下,
反应 1.0h,
以70%的产率得到2-苯基咪唑并(2,1-a)异喹啉
参考文献:
名称:
Anellierte Imidazole
摘要:
AbstractBei der Umsetzung von α‐(3,4‐Dihydroisochinolinium)‐ketonen mit Hydroxylamin bei pH 4–5 entstehen keine Oxime, sondern kondensierte Imidazolderivate. Durch Modellversuche wird ein Reaktionsverlauf über ein N‐substituiertes Hydroxylamin ausgeschlossen.
Copper-Catalyzed Aerobic Oxidative Cyclization of Ketoxime Acetates with Pyridines for the Synthesis of Imidazo[1,2-a]pyridines
作者:Zhi-Hui Ren、Zheng-Hui Guan、Mi-Na Zhao、Yukun Yi、Yao-Yu Wang
DOI:10.1055/s-0035-1561950
日期:——
copper(I)-catalyzed aerobic oxidative coupling of ketoximeacetates with simple pyridines for the synthesis of imidazo[1,2-a]pyridines has been developed. This reaction tolerates a wide range of functional groups and it affords a series of valuable imidazo[1,2-a]pyridines in high yields under mild conditions. A copper(I)-catalyzed aerobic oxidative coupling of ketoximeacetates with simple pyridines for the synthesis
摘要 已开发出铜(I)催化的酮肟肟乙酸酯与简单的吡啶的好氧氧化偶联,用于合成咪唑并[1,2- a ]吡啶。该反应可耐受各种官能团,并且在温和条件下以高收率提供了一系列有价值的咪唑并[1,2- a ]吡啶。 已开发出铜(I)催化的酮肟肟乙酸酯与简单的吡啶的好氧氧化偶联,用于合成咪唑并[1,2- a ]吡啶。该反应可耐受各种官能团,并且在温和条件下以高收率提供了一系列有价值的咪唑并[1,2- a ]吡啶。
Copper‐Catalyzed Aerobic Oxidative CH Functionalization of Substituted Pyridines: Synthesis of Imidazopyridine Derivatives
作者:Jipan Yu、Yunhe Jin、Hao Zhang、Xiaobo Yang、Hua Fu
DOI:10.1002/chem.201302737
日期:2013.12.2
practical method for the synthesis of imidazopyridine derivatives has been developed through the copper‐catalyzed aerobic oxidativeCH functionalization of substitutedpyridines with N‐(alkylidene)‐4H‐1,2,4‐triazol‐4‐amines. The procedure occurs by cleavage of the NN bond in the N‐(alkylidene)‐4H‐1,2,4‐triazol‐4‐amines and activation of an aryl CH bond in the substitutedpyridines. This is the first example
protocol for the C–H sulfonylation of imidazoheterocycles via electrochemical activation was established under batch and flow conditions. The selective C–Hbondfunctionalization proceeded under catalyst- and oxidant-free conditions and tolerated a wide range of functional groups. Various sodium sulfinates as well as imidazo[1,2-a]-pyridines, -pyrimidine, -quinolines, and -isoquinolines, imidazo[1,2-b]pyridazine
在分批和流动条件下,建立了一种通过电化学活化对咪唑杂环进行 C-H 磺酰化的有效且通用的方案。选择性 C-H 键官能化在无催化剂和无氧化剂条件下进行,并耐受多种官能团。各种亚磺酸钠以及咪唑并[1,2- a ]-吡啶、-嘧啶、-喹啉和-异喹啉、咪唑并[1,2- b ]哒嗪、咪唑[2,1- b ]噻唑和苯并[ d ]咪唑并[1,2- b ]噻唑反应成功。有趣的是,在微流体条件下获得了显着的加速和更高的产量。
Three‐Component C–H Bond Sulfonylation of Imidazoheterocycles by Visible‐Light Organophotoredox Catalysis
The first examples of visible‐lightinduced direct sulfur dioxide insertion on imidazoheterocycles have been developed using an organic photoredox catalyst at room temperature and DABCO·(SO2)2. The formation of 2 new C–S bonds, without further pre‐functionalization, in metal‐free and mild conditions render this three‐component approach sustainable and green and led to novel and valuable C‐3 sulfonylated
A rapid and environmentally friendly conversion of pyridine to imidazo[1,2-a]pyridines has been developed via copper-catalyzedaerobicdehydrogenativecyclization with ketone oxime esters.