Approaches to the Construction of Substituted 4-Amino-1H-pyrrol-2(5H)-ones
摘要:
Fully substituted 4-aminopyrrolones are easily accessed via simple routes starting from imines, ketones, or alpha-bromophenyl acetonitriles. Imines were reacted with KCN/NH4Cl in aqueous ethanol to produce alpha-arylamino benzyl cyanides. On the other hand, ketones were transformed to the desired alpha-amino nitriles using a modified Strecker reaction. Then, alpha-amino nitrile precursors were allowed to react with a suitable acyl halide to produce the corresponding amides. Further treatment of these amides with ethanolic KOH converted them to highly substituted 4-amino-1H-pyrrol-2(5H)-one derivatives in moderate to excellent yields.
Copper-Catalyzed Cascade Reaction via Intramolecular Hydroamination Cyclization of Homopropargylic Amines and Intermolecular Povarov Reaction with Imines
作者:Hongkai Wang、Chan Wang、Kaimeng Huang、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1021/acs.orglett.6b00804
日期:2016.5.20
cascade reaction of homopropargylic amines with simple imines is developed in the presence of Cu(OTf)2 and affords a series of hexahydro-1H-pyrrolo[3,2-c]quinoline derivatives in good to high yields. This reaction proceeds through an intramolecular hydroamination cyclization of homopropargylic amine to generate a highly reactive dihydropyrrole intermediate in situ. It subsequently reacts with imine via
在Cu(OTf)2存在下,开发了一种新的单炔胺与单亚丙基胺的级联反应,该反应可提供高产率或高产率的一系列六氢-1 H-吡咯并[3,2- c ]喹啉衍生物。该反应通过均炔丙基胺的分子内加氢胺化环化进行,以原位产生高反应性的二氢吡咯中间体。随后,它通过分子间反电子需求的aza-Diels-Alder反应和1,3-H移位与亚胺反应,形成稠合的吡咯并喹啉结构,形成两个新的C-C键,一个C-N键和一个N –H键。
Divergent Coupling of Alcohols and Amines Catalyzed by Isoelectronic Hydride Mn<sup>I</sup>and Fe<sup>II</sup>PNP Pincer Complexes
作者:Matthias Mastalir、Mathias Glatz、Nikolaus Gorgas、Berthold Stöger、Ernst Pittenauer、Günter Allmaier、Luis F. Veiros、Karl Kirchner
DOI:10.1002/chem.201603148
日期:2016.8.22
Herein, we describe an efficient coupling of alcohols and aminescatalyzed by well‐defined isoelectronic hydride MnI and FeII complexes, which are stabilized by a PNP ligand based on the 2,6‐diaminopyridine scaffold. This reaction is an environmentally benign process implementing inexpensive, earth‐abundant non‐precious metal catalysts, and is based on the acceptorless alcohol dehydrogenation concept
ether, one of the labile thienylimine ligands was substituted by a weekly coordinating diethyl ether solvent molecule giving rise to complex [Ni(η3-allyl)(L2)(O(C2H5)2)][PF6] (2′). All new complexes 1 [Ni(η3-allyl)(2,6-dimethyl-N-(thiophen-2-ylmethylene)aniline)2][PF6], 2 [Ni(η3-allyl)(2,6-diisopropyl-N-(thiophen-2-ylmethylene)aniline)2][PF6], 3 [Ni(η3-allyl)(4-methyl-N-(thiophen-2-ylmethylene)aniline)2][PF6]
Highly Regioselective Synthesis of Substituted Pyrroles Utilizing Low-Valent Titanium Reagent
作者:Daqing Shi、Guolan Dou、Chunling Shi、Zhengyi Li、Shun-Jun Ji
DOI:10.1055/s-2007-990787
日期:2007.10
A short and efficientsynthesis of substituted pyrroles was accomplished in good yields via the novel coupling cyclization reaction of 1,3-diketones with imines promoted by low-valenttitaniumreagent. High regioselectivity was achieved and the structures of two of the products were confirmed by X-ray diffraction studies.
通过低价钛试剂促进的 1,3-二酮与亚胺的新型偶联环化反应,以良好的收率完成了取代吡咯的短而有效的合成。实现了高区域选择性,并且通过 X 射线衍射研究证实了两种产物的结构。
Evaluation of N-(2-Thienylidene)amines, N-(2-Hydroxybenzylidene)amines and 3-Iminoindolin-2-ones as Antileishmanial Agents
作者:Yasser M.S.A. Al-Kahraman、Girija S. Singh、Masoom Yasinzai
DOI:10.2174/157018011795514221
日期:2011.6.1
The paper describes the synthesis and antileishmanial activity of N-substituted imines, obtained from the reactions of primary amines with three biologically important aldehydes/ketones, thiophene-2-carbaldehyde, 2- hydroxybenzaldehyde (salicylaldehyde) and indoline-2,3-dione. Of the fourteen compounds screened from three classes, five compounds showed significant antileishmanial activity. Among the three classes of imines, the class of N-(2- thienylidene)amines showed much better activity than the other two classes. N-(2-Thienylidene)benzhydrylamine showed IC50 value of 0.51 μg/ml. The effect of substituents on the bioactivity is discussed.