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).
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.
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
Harnessing Nucleophilicity of Allenol Ester with <i>p-</i>Quinone Methides via Gold Catalysis: Application to the Synthesis of Diarylmethine-Substituted Enones
作者:Brijesh M. Sharma、Jayant Rathod、Rajesh G. Gonnade、Pradeep Kumar
DOI:10.1021/acs.joc.8b01294
日期:2018.8.17
A gold(I)-catalyzed protocol for intermolecular 1,6-conjugate addition of nucleophilic allenol ester generated in situ through [3,3]-sigmatropicrearrangement with p-quinone methides (p-QMs) has been developed. The gold catalyst plays a dual role by the π-acid-triggered activation of alkynes and at the same time as a Lewis acid for activation of p-QMs toward nucleophilic attack. This method enables
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.