New routes toward selective synthesis of both mono- and diaryl maleimides have been innovated. The mere requirement to this end is through the increase of temperature. The method works effectively for maleic anhydride and maleic acid as well. Also, the first expedient synthesis of 2-arylnaphthoquinones via the reaction of naphthoquinone with arenesulfonyl chlorides is revealed.
A Unified Approach for Divergent Synthesis of Heterocycles
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TMSOTf‐Catalyzed Formal [3+2] Cycloaddition of Electron‐Rich Alkynes
作者:Ping Chen、Wei Cao、Xiangqian Li、Dayong Shi
DOI:10.1002/adsc.202100769
日期:2021.10.19
construction of polysubstituted five-membered heterocycles via TMSOTf-catalyzed formal [3+2] cycloaddition of electron-rich alkynes, which features free from any metal, atom economy and water as the main by-product. Furthermore, alkenyl ether adduct has been verified as the key intermediate. Notably, by utilizing this approach, we can synthesize a broad range of polysubstituted furans, thiophenes and pyrroles
The colourful fluorescence from readily-synthesised 3,4-diaryl-substituted maleimide fluorophores
作者:Hsiu-Chih Yeh、Wei-Ching Wu、Chin-Ti Chen
DOI:10.1039/b211537a
日期:2003.1.23
A new synthesis procedure has been developed for a series of maleimide-based fluorophores, exhibiting a large variation of emission spectra spanning the entire visible range.
Palladium-catalyzeddirectarylation of maleimides via Heck as well as organoboron-mediated Heck-type reactions are developed. These methods offer an approach to a wide variety of biologically interesting 3,4-diarylmaleimide scaffolds from readily accessible starting materials. These approaches led to the feasible one-pot construction of bisaryl-substituted maleimides which have historically been problematic
Derivative of α,β-Dicyanostilbene: Convenient Precursor for the Synthesis of Diphenylmaleimide Compounds, <i>E</i><i>−</i><i>Z</i> Isomerization, Crystal Structure, and Solid-State Fluorescence
formation reaction of the maleimide compounds from either fumaronitrile or maleonitrile derivatives. Single-crystal X-ray structures of these three fumaronitrile derivatives, the first three of the kind, were obtained, revealing the nonplanar molecular structure. We ascribe the strong solid-state fluorescence of these diphenylfumaronitrile derivatives to the nonplanar structure that inhibits the close packing
通过改进的合成的二芳基取代的富马腈,开发了一种方便有效的方法来制备3,4-二芳基取代的马来酰亚胺。分析并改进了由苯基乙腈化合物合成二苯基取代的富马腈衍生物的方法。我们发现甲醇钠的化学计量和原料苯乙腈衍生物的浓度对于产品的高收率和易于纯化至关重要。特别是,通过简单的抽滤将双(4-溴苯基)富马腈,双(3-三氟甲基苯基)富马腈和双(4-甲氧基苯基)富马腈以70-90%的高收率分离出来。此外,1 H NMR提供了令人信服的证据,表明E - Z富马腈或马来腈衍生物与马来酰亚胺化合物的形成反应涉及异构化。获得了前三种三类富马腈衍生物的单晶X射线结构,揭示了非平面分子结构。我们将这些二苯基富马腈衍生物的强固态荧光归因于非平面结构,该结构抑制了分子聚集的紧密堆积,从而抑制了荧光猝灭。