5198-48-1Relevant articles and documents
Synergetic activation of CO2by the DBU-organocatalyst and amine substrates towards stable carbamate salts for synthesis of oxazolidinones
Chen, Xiao-Chao,Liu, Ye,Lu, Yong,Yao, Yin-Qing,Zhao, Kai-Chun
, p. 7072 - 7082 (2021/11/17)
The development of an efficient methodology to transform CO2 into valuable chemicals has attracted increasing attention concerning the challenging issues of CO2-utilization. Herein, an efficient approach for the preparation of oxazolidinones from CO2, primary (aliphatic/aromatic) amines and 1,2-dichloroethane (or its derivatives) catalyzed by DBU organo-superbase was achieved with yields of 47-97% under mild conditions (80-100 °C, 12 h, 1.0 MPa CO2). Control experiments demonstrated that the formation of an ion-pair carbamate salt intermediate IS-B derived from the reaction of CO2, DBU (catalyst) and an amine (substrate) was the key step for this three-component reaction. The available DBU-amine-CO2 adduct intermediate (like IS-B-2) with fair stability will evolve into the thermodynamically stable product oxazolidinones upon attack of 1,2-dichloroethane (or its derivatives), along with the regeneration of the DBU catalyst. Alternatively, the decomposition of the DBU-aryl amine-CO2 adduct (like IS-B-1) with relatively poor stability also could result in the competitive substitution reaction of 1,2-dichloroethane (or its derivatives) with the aryl amine. This work provides insights into synergetic CO2-activation by the DBU-catalyst and a nucleophilic amine-substrate via the formation of robust carbamate salt intermediates responsible for the final production of oxazolidinones. This journal is
Method for synthesizing cyclic amide from carbon dioxide
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Paragraph 0015, (2019/12/29)
The invention discloses a method for synthesizing cyclic amide from carbon dioxide. An aromatic amino compound, 1 atm carbon dioxide and a halogenated compound undergo a one-step reaction under the synergistic action of N-doped TiO2 and an inorganic salt catalyst to generate the cyclic amide. Studies find that visible light has an obvious promoting effect on the conversion process. The chemical selectivity of the cyclic amide compound can be regulated by regulating conditions such as reaction temperature, time and illumination. The catalyst can be recycled for five times after being separatedand dried, and the activity and the chemical selectivity can be well maintained. The synthesis method has the advantages of simple synthetic route, novelty, simple process, high yield and high purityof the product, cheap and easily available catalyst, no influences on the environment, and suitableness for industrial production.
Spirulina (Arthrospira) platensis Supported Ionic Liquid as a Catalyst for the Synthesis of 3-Aryl-2-oxazolidinones from Carbon Dioxide, Epoxide, Anilines
Sadeghzadeh, Seyed Mohsen,Zhiani, Rahele,Emrani, Shokufe
, p. 119 - 124 (2017/10/30)
Abstract: This study investigates the potential application of the (Ammonio)butane-1-sulfonate modified Spirulina (Arthrospira) platensis biomasses in the synthesis of 3-aryl-2-oxazolidinones from CO2, ethylene oxide, and anilines. High catalytic activity and ease of recovery from the reaction mixture using filtration and several reuse times without significant losses in performance are additional eco-friendly attributes of this catalytic system. The effects of the structure of ionic liquid on the catalytic performance were investigated and the various reaction conditions were optimized. This observation was exploited in the direct and selective chemical fixation of CO2, affording high degrees of CO2 capture and conversion. Graphical Abstract: [Figure not available: see fulltext.].
