Eosin Y‐catalyzed reductive homocoupling of para‐quinone methides under visible‐light
摘要:
In this manuscript, we demonstrate a visible‐light driven dimerization of para‐quinone methides using eosin Y catalyst via a reductive homocoupling process. This mild and operationally simple methodology was found to be compatible with a variety of differently substituted para‐quinone methides and a broad range of tetra‐arylethane derivatives were obtained in moderate to good yields (47%–87%).
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.
transition metal freevisiblelight mediated organo photoredox catalyzed trifluoromethylation of p-quinone methides (p-QMs) to construct fluoro-analogs of dichlorodiphenyltrichloroethane (DDT) is reported using a bench stable, inexpensive Langlois reagent as a trifluoromethyl radical source. This protocol could generate a benzylic C(sp3)-CF3 bond with excellent yield undermildreactionconditions using 1,6-conjugate
Enantio- and diastereoselective diarylmethylation of 1,3-dicarbonyl compounds
作者:Xin Li、Songtao He、Qiuling Song
DOI:10.1039/d0sc00142b
日期:——
diastereoselective diarylmethylation of 1,3-dicarbonylcompounds is described. It is a successful example of constructing all-carbon quaternary stereocenters from 3 °C–H nucleophiles, a challenging topic in synthetic chemistry. In the present work, two contiguous stereocenters are constructed with high levels of stereoselectivity and atom economy. The broad scope of 1,3-dicarbonyl nucleophiles and the tolerance
Iron-Catalyzed Ring Opening of Cyclopropanols and Their 1,6-Conjugate Addition to <i>p</i>-Quinone Methides
作者:Baliram B. Mane、Suresh B. Waghmode
DOI:10.1021/acs.joc.1c02059
日期:2021.12.17
A novel iron-catalyzed ringopening of cyclopropanols and their 1,6-conjugate addition to p-quinone methides for accessing substituted phenols is disclosed. In this protocol, various cyclopropanols are converted to alkyl radicals and undergo 1,6-conjugate addition to p-quinone methides toward C–C bond formation. The salient features of this methodology include operationally simple and mild reaction