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).
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.
Metal-free, Tf2NH-catalyzed 1, 6-conjugate addition of imidazopyridine to para-quinone methides: Easy access to C3-functionalized triarylmethane imidazopyridine
作者:Nilesh S. Khonde、Madhukar S. Said、Jagjivan K. Sabane、Jayant M. Gajbhiye、Pradeep Kumar
DOI:10.1016/j.tet.2021.132510
日期:2021.11
An inexpensive and commercially available Tf2NH-catalyzed 1,6-conjugate addition of imidazopyridine (IMPY) heterocycles to para-quinone methides (p-QMs) is reported. The present transformation provides a diverse class of C3-functionalized triarylmethanes heterocyclic derivatives of imidazopyridine. These metal-free transformations provided a very broad substrate scope of conjugate addition product
Fe-Catalyzed Hydroalkylation of Olefins with <i>para</i>-Quinone Methides
作者:Yangyong Shen、Jifeng Qi、Zhenjun Mao、Sunliang Cui
DOI:10.1021/acs.orglett.6b01173
日期:2016.6.3
A novel Fe-catalyzed hydroalkylation of olefins with para-quinone methides (p-QMs) for accessing phenols has been developed. In this protocol, various olefins could convert to alkyl radicals and undergo addition to para-quinone methides toward C–C bond formation and aromatization. The reaction conditions are mild and the substrate scopes are broad.
Metal-free, radical 1,6-conjugated addition of cyclic ethers with <i>para</i>-quinone methides (<i>p</i>-QMs)
作者:Satish G. More、Gurunath Suryavanshi
DOI:10.1039/c9ob00127a
日期:——
An efficient method for metal-free C–C bond formation between p-quinone methides (p-QMs) and cyclic ethers via a radical pathway to afford substituted diarylmethanes and triarylmethanes or to effect the α-alkylation of the cyclic ethers has been developed. Also, the synthesis of 3,3′-disubstituted oxindoles with stereogenic quaternary carbon centers was successfully achieved under mild reaction conditions