Recyclable Bismuth Complex Catalyzed 1,6-Conjugate Addition of Various Nucleophiles to <i>para</i>
-Quinone Methides: Expedient Access to Unsymmetrical Diaryl- and Triarylmethanes
作者:Xianghao Liang、Haiyan Xu、Hanlin Li、Lizhuang Chen、Hongfei Lu
DOI:10.1002/ejoc.201901732
日期:2020.1.16
An efficient method for the 1,6‐conjugateaddition of para‐quinonemethides with readily available nucleophiles was developed. This protocol provides straightforward access to a class of diaryl and triarylmethane derivatives with good to excellent yields in the presence of (C4H12N2)2[BiCl6]Cl·H2O. Moreover, this bismuth complex can be recycled for several times.
已开发出一种有效的方法,可将1,6-共轭对苯二甲酰甲基与易得的亲核试剂加在一起。在(C 4 H 12 N 2)2 [BiCl 6 ] Cl · H 2 O存在下,该方案可以直接获得具有良好产率或优异产率的二芳基和三芳基甲烷衍生物。此外,该铋络合物可回收用于几次。
Base-promoted 1,6-conjugate addition of alkylazaarenes to <i>para</i>-quinone methides
作者:Amritha Rayaroth、Rajat Kumar Singh、Kalyanakrishnan A. V.、Krishna Hari、Alagiri Kaliyamoorthy
DOI:10.1039/d0ob00419g
日期:——
1,1,2-Triarylethanes embedded with an azaarene unit were prepared in a single step at ambient temperature via the sodium hexamethyldisilazide mediated 1,6-conjugate addition of unactivated alkylazaarenes on para-quinone methides (p-QMs).
Electrochemical Radical δ-H Sulfonylation Reaction for the Synthesis of 4-((Aryl,Arylsul fonyl)methylene)-2,5-Cyclohexadiene Derivatives
作者:Lei Dai、Qiuyu Yu、Jinghang Zhang、Fan Wu、Chang Wang、Jinpeng Zhang、Liangce Rong
DOI:10.1021/acs.joc.1c01213
日期:2021.8.6
A novel and efficient electrochemical radical δ-H sulfonylation reaction of para-quinone methides (p-QMs) and sodium sulfinates has been achieved under common laboratory conditions. In this strategy, a new C(sp2)–S bond was constructed for the synthesis of 4-((aryl,arylsulfonyl)methylene)-2,5-cyclohexadiene derivatives with a broad substrate scope, good functional group tolerance, and mild conditions
Hf(OTf)<sub>4</sub>-Catalyzed 1,6-Conjugate Addition of 2-Alkyl-azaarenes to <i>para</i>-Quinone Methides
作者:Xinyuan Liu、Binbin Liu、Zhan Shi、Chen Tan、Rong Fan、Zhi Li、Jiajing Tan
DOI:10.1021/acs.joc.0c02982
日期:2021.2.19
Herein we reported a Hf(OTf)4-catalyzed carbon–carbonbondformation reaction between 2-alkyl-azaarenes and para-quinone methides (p-QMs). This 1,6-conjugate addition protocol offered rapid access to a large array of triarylethane products in good yields. The catalyst loading could be reduced to 1 mol %. Studies pertinent to scale-up reaction and product derivatization were also presented.
Thiourea catalyzed 1,6-conjugate addition of indoles to para-quinone methides
作者:Guangmiao Wu、Tao Li、Fuhai Liu、Yulong Zhao、Shiqiang Ma、Shouchu Tang、Xingang Xie、Xuegong She
DOI:10.1016/j.tetlet.2021.153315
日期:2021.9
An efficient thiourea catalyzed 1,6-conjugate addition of indoles to -quinone methides (-QMs) was developed. -QMs was activated by a weak hydrogen-bond effect. The reaction is featured mild reaction conditions and wide substrate scope. A series of C-3 bisaryl methine substituted indoles are prepared in high yield.