3574-02-5Relevant academic research and scientific papers
Chemodivergent Synthesis of Oxazoles and Oxime Ethers Initiated by Selective C-N/C-O Formation of Oximes and Diazo Esters
Qi, Zhenjie,Wang, Shaozhong
supporting information, p. 8549 - 8553 (2021/10/25)
Chemodivergent reactions of oximes and diazo esters involving Rh-catalyzed [3+2] annulation and photodriven O-H insertion have been developed to generate oxazoles and oxime ethers. A range of aldehyde and ketone oximes reacted with α-diazocarbonyl compounds in a controllable manner in which functional groups, including ketone, ester, amide, ether, thiol ether, silane, alkene, allene, and alkyne groups, were well tolerated.
Visible Light-Induced Copper-Catalyzed C—H Arylation of Benzoxazoles?
Ma, Xiaodong,Zhang, Guozhu
supporting information, p. 1299 - 1303 (2020/08/05)
A general method for visible light-induced copper-catalyzed arylation of sp2 C—H bonds of azoles has been developed. The method employs aryl halide as the coupling partner, lithium alkoxide as base. A variety of azoles including benzooxazole and benzothiazole can be arylated. Furthermore, electron-poor heterocycles such as thiophene possessing one electron-withdrawing group can also be arylated.
Radical cascade synthesis of azoles: via tandem hydrogen atom transfer
Chen, Andrew D.,Herbort, James H.,Mustafa, Darsheed N.,Nagib, David A.,Nakafuku, Kohki M.,Wappes, Ethan A.
, p. 2479 - 2486 (2020/03/19)
A radical cascade strategy for the modular synthesis of five-membered heteroarenes (e.g. oxazoles, imidazoles) from feedstock reagents (e.g. alcohols, amines, nitriles) has been developed. This double C-H oxidation is enabled by in situ generated imidate
ORGANIC COMPOUNDS AND ORGANIC ELECTRO LUMINESCENCE DEVICE COMPRISING THE SAME
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Paragraph 0213; 0220-0224, (2019/11/27)
The present invention relates to a novel compound and an organic electroluminescent device comprising the same. A compound according to the present invention is used for an organic layer, preferably a light emitting layer, a hole transporting layer, an electron transport layer, or an electron transport auxiliary layer of the organic electroluminescent device, thereby being able to improve luminous efficiency, driving voltage, lifespan and the like of the organic electroluminescent device.COPYRIGHT KIPO 2019
Iodine Promoted One-Pot Synthesis of 2-Aryl Benzoxazoles from Amidoximes via Oxidative Cyclization and Ring Contraction
Zhang, Yong,Ji, Min
supporting information, p. 7506 - 7510 (2019/11/28)
A molecular I2-promoted one-pot synthesis of 2-aryl benzoxazoles has been developed by using amidoximes rather than the limited 2-aminophenols or 2-haloamides as substrates. The amidoxime substrates provided unique and efficient strategies for converting readily available aniline and benzaldehyde precursors into valuable chemicals. This transformation proceeded smoothly under transition-metal-free conditions through a sequential oxidative cyclization and ring contraction, and provided a potential route for introducing certain groups at any site of the scaffold.
Facile Protocols towards C2-Arylated Benzoxazoles using Fe(III)-Catalyzed C(sp 2 -H) Functionalization and Metal-Free Domino Approach
Vodnala, Nagaraju,Gujjarappa, Raghuram,Kabi, Arup K.,Kumar, Mohan,Beifuss, Uwe,Malakar, Chandi C.
supporting information, p. 1469 - 1478 (2018/05/25)
Considering their growing attention in the field of medicinal chemistry and drug-discovery research, the facile and convenient approaches towards the preparation of 2-aryl benzoxazole derivatives have been described. The transformation is accomplished by using Fe(III)-catalyzed C-H activation of benzoxazoles with boronic acids to obtain a wide range of C2-arylated benzoxazoles in high yields. The developed method excludes the formation of self-coupling compounds as side products. On the other hand, the synthesis of the products is also achieved via a metal-free domino protocol by the reaction between 1-nitroso-2-naphthol and acetophenones using catalytic amounts of CBr 4 in the presence of Cs 2 CO 3 as base. The devised tandem method avoids the use of pre-activated α-haloketones as substrates. Due to their immense impact in marketed drugs and molecules under clinical trial, the described method can be a powerful tool for their synthesis which restricts the use of precious metals as catalyst.
Preparation method of 2-substituted aryl oxazole
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Paragraph 0013; 0015-0017, (2018/04/01)
The invention provides a preparation method of 2-substituted aryl oxazole. 2-substituted aryl oxazole compounds are prepared from phenol compounds and aldoxime ester compounds through a reaction. Thecorresponding 2-substituted aryl oxazole compounds can be prepared from the phenol compounds and the aldoxime esters by reacting in an organic solvent with catalysis of iron under mild conditions. Themethod has the advantages that reagents are economical and easily available, the application range of substrates is wide, the reaction conditions are mild, the operation is simple and the like.
Iron-catalyzed synthesis of benzoxazoles by oxidative coupling/cyclization of phenol derivatives with benzoyl aldehyde oximes
Gao, Sen,Gao, Liming,Meng, Hong,Luo, Meiming,Zeng, Xiaoming
, p. 9886 - 9889 (2017/09/11)
An iron-catalyzed oxidative coupling/cyclization reaction for the synthesis of benzoxazoles at room temperature is reported. This reaction was enabled by an inexpensive iron(iii) catalyst by treating readily available phenol derivatives with benzoyl aldehyde oximes. Mechanistic studies show that benzoyl aldehyde oxime is not only used as a substrate, but also serves as an ancillary ligand to support the iron salt in the promotion of the transformation.
2-substituted benzoxazole preparation method of compound
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, (2016/10/20)
The invention relates to a preparing method of 2-substituted benzoxazole compounds. The compounds are obtained by reaction of products obtained by reaction of acyl chloride and o-nitrophenol or derivatives thereof under catalyzing of reducing agent ammonium formate, a solvent and palladium-containing agents. According to the method, the reaction condition is mild, environment is protected, raw materials are rich and easy to obtain, operation is easy, yield is high, and various kinds of performance are optimized.
