A Copper‐Catalyzed Synthesis of Pyrroles through Photochemically Generated Acylazirines
作者:Jan Paternoga、Till Opatz
DOI:10.1002/ejoc.201901176
日期:2019.11.14
A protocol for the synthesis of highly substituted 2,4‐diacypryrroles via a copper‐catalyzed ring strain releasing dimerization reaction was developed. The pyrroles are synthesized combining UV–photochemistry and metal‐catalyzed follow up reaction in an one‐pot system. To match the rates of the thermal and the photoinduced step, an internal temperature control was established.
Reactions of benzoylheteroaroylmethanes with hydroxylamine hydrochloride
作者:Alistair D. Mitchell、Derek C. Nonhebel
DOI:10.1016/0040-4020(76)87030-5
日期:1976.1
predominantly 5-(2-furyl)-3-phenylisoxazole and not as reported in the literature 3-(2-furyl)-5-phenylisoxazole. Benzoyl-2-thenoylmethane and benzoylpicolinoylmethane afforded 3-phenyl-5-(2-thienyl)isoxazole and 5-phenyl-3-(2-pyridyl)isoxazole respectively.
Copper(0) Nanoparticles in Click Chemistry: Synthesis of 3,5-Disubstituted Isoxazoles
作者:T. M. Vishwanatha、Vommina V. Sureshbabu
DOI:10.1002/jhet.2065
日期:2015.11
An efficient procedure for the synthesis of 3,5‐disubstituted isoxazoles via [3 + 2] cycloaddition reaction of in situ generated nitrileoxides with acetylenes employing readily preparable copper(0) nanoparticles is described. A variety of in situ generated nitrileoxide and acetylenic substrates were engaged in the study and found to undergo cyclization in short duration affording respective isoxazoles
Studies of Heteroaromaticity. IV. The Thermal 1,3-Dipolar Cycloaddition of Fur- and 5-Nitro-2-furhydroxamoyl Chlorides with Olefinic and Acetylenic Compounds
作者:Tadashi Sasaki、Toshiyuki Yoshioka
DOI:10.1246/bcsj.40.2604
日期:1967.11
3-dipolar cycloaddition with olefinic and acetylenic dipolarophiles by two methods, a) and b). Here, method a) means the routine method via nitrile oxide formation, while method b) means the new type of reaction named in the title. Method b) is concluded to be superior to method a) for the purpose of preparing isoxazoles and isoxazolines. The mechanism of the thermal 1, 3-dipolar cycloaddition is discussed
相应的异恶唑啉和异恶唑是通过 1, 3-偶极环加成与烯属和炔属偶极亲和体通过两种方法 a) 和 b) 制备的。这里,方法a)是指通过氧化腈形成的常规方法,而方法b)是指标题中命名的新型反应。结论方法b)在制备异恶唑和异恶唑啉方面优于方法a)。讨论了热 1, 3-偶极环加成反应的机理。
Synthesis of Isoxazoles via One-Pot Oxidation/Cyclization Sequence from Propargylamines
作者:Mengyan Duan、Guodong Hou、Yabiao Zhao、Congjun Zhu、Chuanjun Song
DOI:10.1021/acs.joc.2c00896
日期:2022.8.19
A facile strategy for the synthesis of isoxazoles has been efficaciously developed, which involves oxidation of propargylamines to the corresponding oximes followed by CuCl-mediated intramolecular cyclization of the latter. This protocol shows a straightforward way to construct a series of isoxazole cores with a wide range of functional group compatibility. Meanwhile, a gram-scale experiment and synthetic