719-59-5Relevant articles and documents
Preparation method of 2-amino-5-chlorobenzophenone
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Paragraph 0025-0053, (2022/01/08)
The present invention proposes a method for preparing 2-amino-5-chlorobenzophenone, comprising: Step S1, the 5-chloro-3-phenyl-2,1-benzisoxazole is mixed with a catalyst, ethyl acetate is added, stirred until dissolved, the reaction system is maintained in a hydrogen atmosphere, the reaction pressure is controlled at 1-5atm, 20-30 ° C reaction; step S2, the reaction solution obtained in step S1 is filtered and the solvent is removed, the thick is obtained, a crystalline solvent is added to the thick, and after heating and dissolving, Cooling crystallization is filtered to give 2-amino-5-chlorobenzophenone. The preparation of the opposite of the present invention compared to the prior art, the yield of the product is higher, while there are fewer impurities, the reaction conditions are relatively mild, suitable for large-scale industrial applications.
One-Pot Synthesis of 2-Aminobenzophenones from 2-Alkynyl Arylazides Catalyzed by Pd and Cu Precursors
Fan, Hui,Xu, Shijie,Yang, Fan,Zhang, Xiaoxiang,Zhao, Xuechun
supporting information, p. 4555 - 4558 (2021/08/30)
We describe a novel one-pot three-step reaction of 2-alkynyl arylazides through palladium-catalyzed formation of 3-hydroxy-3-phenylindolin-2-ones followed by hydrolysis of amide bonds and copper-catalyzed decarboxylation to give 2-aminobenzophenones. This synthetic method works well with various 2-alkynyl arylazides and affords the products in moderate to good yields under mild reaction conditions.
One-Pot Synthesis of Spirocyclopenta[ a]indene Derivatives via a Cascade Ring Expansion and Intramolecular Friedel-Crafts-Type Cyclization
Li, Quanzhe,Liu, Jiaxin,Wei, Yin,Shi, Min
supporting information, p. 2438 - 2455 (2020/01/31)
A one-pot efficient synthetic approach for the rapid construction of spirocyclopenta[a]indene derivatives has been developed via an iodine-initiated cascade ring expansion and intramolecular Friedel-Crafts-type cyclization from propargyl alcohol-tethered alkylidenecyclobutanes under mild conditions with broad substrate scope. This cascade process can be elegantly conducted on a gram scale. A plausible reaction mechanism has been proposed on the basis of a series of deuterium labeling and control experiments.