作者:Cong Ye、Bao-Gui Cai、Juan Lu、Xiao Cheng、Lei Li、Zhong-Wen Pan、Jun Xuan
DOI:10.1021/acs.joc.0c02500
日期:2021.1.1
A blue-light-emitting diode (LED) promoted coupling of aryl diazoacetates with sulfurylides is described. This protocol features mild conditions, good functional group tolerance, and broad substrate scope for both aryl diazoacetates with sulfurylides. Under optimal reaction conditions, a wide range of trisubstituted olefins is obtained in moderate to good yield, which can be further transferred to
Construction of a Benzo[<i>b</i>]azepine Skeleton through Decarboxylative Ylide [6+1] Annulations with Modified Vinyl Benzoxazinanones
作者:Qing-Zhu Li、Zhi-Qiang Jia、Lin Chen、Xiang Zhang、Hai-Jun Leng、Rong Zeng、Yan-Qing Liu、Wen-Lin Zou、Jun-Long Li
DOI:10.1021/acs.orglett.0c04041
日期:2021.2.5
A Lewis acid-promoted [6+1] annulation between sulfur ylides and modified vinyl benzoxazinanones was described. In this reaction, the newly designed vinyl benzoxazinanones could serve as a novel six-atom synthon, and the key to success is the installation of an electron-withdrawing group on the alkene moiety of the benzoxazinanones. A broad range of substrates are compatible with this mild reaction
描述了路易斯酸促进硫基化物和改性乙烯基苯并恶嗪酮之间的[6 + 1]环化。在该反应中,新设计的乙烯基苯并恶嗪酮可以用作新型的六原子合成子,成功的关键是在苯并恶嗪酮的烯烃部分上安装了一个吸电子基团。各种各样的底物都与这种温和的反应体系兼容,从而为构建苯并[ b ]氮杂骨架提供了简便实用的方法。
Highly diastereoselective synthesis of cyclopropane-fused spiro-pseudoindoxyl derivatives through [2 + 1] annulation of 2-ylideneoxindoles and sulfonium bromides
Syntheses of 2-Aroyl Benzofurans through Cascade Annulation on Arynes
作者:Pashikanti Gouthami、Lahu N. Chavan、Rambabu Chegondi、Srivari Chandrasekhar
DOI:10.1021/acs.joc.8b00360
日期:2018.3.16
The highlyefficient and expedient route for the syntheses of 2-aroyl benzofurans has been developed via the cascade [2+2] followed by a [4+1] annulation on arynes. The overall transformation proceeded through the formation of ortho-quinone methide by the insertion of transient aryne into N,N-dimethylformamide and subsequent trapping with sulfurylide. Moreover, this transformation has a broad range
A simple, general route to the 2,3-dihydrobenzofurans substituted at C3 by an aryethynyl or aryl group, starting from propargylamine and itsderivatives with benzoyl sulfonium salts, has been developed. This reaction involved an in situ generated o-quinone methide (o-QM) intermediate followed by [4+1] annulation with sulfur ylides. Notably, this protocol's features include moderate to excellent yields