[2 + 2 + 1] Heteroannulation of Alkenes with Enynyl Benziodoxolones and Silver Nitrite Involving C≡C bond Oxidative Cleavage: Entry to 3-Aryl-Δ<sup>2</sup>-isoxazolines
作者:Cheng-Yong Wang、Fan Teng、Yang Li、Jin-Heng Li
DOI:10.1021/acs.orglett.0c01285
日期:2020.6.5
A copper-catalyzed [2 + 2 + 1] heteroannulation of alkenes with enynyl benziodoxolones and AgNO2 involving oxidative cleavage of the C≡C bond promoted by cooperative Zn(OTf)2, KOAc, and 4 Å MS for producing 3-aryl Δ2-isoxazolines is reported. Mechanistic studies indicate that AgNO2 serves as the N/O two-atom unit source, enabling the formation of three bonds through NO2 addition across the C≡C bond
铜催化的[2 + 2 + 1]烯烃与烯丙基苯并恶唑烷酮和AgNO 2的杂环化反应,涉及由Zn(OTf)2,KOAc和4ÅMS协同促进的C≡C键的氧化裂解,从而产生3-芳基Δ报告了2-异恶唑啉。机理研究表明,AgNO 2充当N / O两原子单元源,可通过在C≡C键,NO转移,C≡C键裂解和环合级联反应中添加NO 2形成三个键。