Unusual Reactivity of 4-Vinyl Isoxazoles in the Copper-Mediated Synthesis of Pyridines, Employing DMSO as a One-Carbon Surrogate
作者:Pravin Kumar、Manmohan Kapur
DOI:10.1021/acs.orglett.0c01935
日期:2020.8.7
An efficient protocol for the synthesis of nicotinate derivatives and tetrasubstituted pyridines through a copper-mediated cleavage of isoxazoles has been developed. The highlight of the work is the observation of an unusualreactivity of 4-vinyl isoxazoles under the reaction conditions. DMSO serves as a one-carbon surrogate generating an active methylene group during the reaction to form two C–C bonds
<i>tert</i>-Butyl nitrite triggered radical cascade reaction for synthesizing isoxazoles by a one-pot multicomponent strategy
作者:Leijing Chen、Zhen Wang、Hui Liu、Xinyue Li、Bin Wang
DOI:10.1039/d2cc02823a
日期:——
TBN/Na2S2O8-mediated radical cascade reaction of alkenes with aldehydes involving the formation of diverse new bonds in one-pot.
TBN/Na2S2O8介导的烯烃与醛的自由基级联反应,涉及在一个反应体系中形成多种新键。
Discovery of 4-nitro-3-phenylisoxazole derivatives as potent antibacterial agents derived from the studies of [3 + 2] cycloaddition
作者:Yan Zhang、Zhiwu Long、Longjia Yan、Li Liu、Lan Yang、Yi Le
DOI:10.1039/d2ra05009a
日期:——
Polysubstituted phenylisoxazoles were designed and synthesized to discover new antibacterial agents via [3 + 2] cycloaddition. Thirty-five compounds with a phenylisoxazole scaffold were characterized by NMR, HRMS, and X-ray techniques. After being evaluated against Xanthomonas oryzae (Xoo), Pseudomonas syringae (Psa), and Xanthomonas axonopodis (Xac), 4-nitro-3-phenylisoxazole derivatives were found
Synthesis of Dibenzosuberones Bearing an Isoxazole Group via Palladium-Catalyzed Intramolecular C–H/C–Br Bond Cross-Coupling of Ortho-Aroylated 3,5-Diarylisoxazoles
bearing an isoxazole group in 24 to >99% 1H NMR yields. The dibenzosuberone structure was further confirmed by X-ray crystallography. The developed methodology exhibits very good functional group tolerance. In addition, a rational mechanism was presented for describing the reaction process. For the prepared dibenzosuberone, the use of Mo(CO)6 as the catalyst can easily transform the isoxazolering into the