3233-06-5Relevant articles and documents
METHOD FOR PRODUCING AROMATIC AMINE COMPOUNDS FROM PHENOLS
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Paragraph 0017; 0046, (2021/06/04)
PROBLEM TO BE SOLVED: To provide a method for producing an aromatic amine compound from phenols and amines with a high yield and a high selectivity, which includes ones subjected to polyfunctionalization, under relatively low temperature and relatively low pressure, without using an additive which gives a co-product having high environmental load. SOLUTION: Phenols and hydrogen are introduced into a first catalyst cartridge receiving a solid catalyst containing platinum group elements and continuously hydrogenated into cyclohexanones. The resultant cyclohexanones, along with amines selected from ammonia, primary amines and secondary amines, and hydrogen trapping agents are subsequently introduced into a second catalyst cartridge receiving a solid catalyst containing platinum group elements to continuously produce aromatic amine compounds by dehydration condensation and dehydrogenation with amines. SELECTED DRAWING: Figure 2 COPYRIGHT: (C)2021,JPOandINPIT
Continuous Synthesis of Aryl Amines from Phenols Utilizing Integrated Packed-Bed Flow Systems
Ichitsuka, Tomohiro,Kobayashi, Shū,Koumura, Nagatoshi,Sato, Kazuhiko,Takahashi, Ikko
, p. 15891 - 15896 (2020/07/13)
Aryl amines are important pharmaceutical intermediates among other numerous applications. Herein, an environmentally benign route and novel approach to aryl amine synthesis using dehydrative amination of phenols with amines and styrene under continuous-flow conditions was developed. Inexpensive and readily available phenols were efficiently converted into the corresponding aryl amines, with small amounts of easily removable co-products (i.e., H2O and alkanes), in multistep continuous-flow reactors in the presence of heterogeneous Pd catalysts. The high product selectivity and functional-group tolerance of this method allowed aryl amines with diverse functional groups to be selectively obtained in high yields over a continuous operation time of one week.
Bifunctional organocatalysts for the conversion of CO2, epoxides and aryl amines to 3-aryl-2-oxazolidinones
Xie, Ya-Fei,Guo, Cheng,Shi, Lei,Peng, Bang-Hua,Liu, Ning
, p. 3497 - 3506 (2019/04/14)
A route to synthesize 3-aryl-2-oxazolidinones is developed, which is achieved through a three component reaction between CO2, aryl amines, and epoxides with a binary organocatalytic system composed of organocatalysts and DBU (1,8-diazabicyclo[5.4.0]undec-7-ene). The method allows wide scopes of epoxide and aryl amine substrates with various functional groups under mild reaction conditions. The control experiments indicate that a cyclic carbonate is formed via cycloaddition of epoxides with CO2, which further reacts with the β-amino alcohol originating from epoxides and aryl amines, resulting in the formation of 3-aryl-2-oxazolidinones finally.
