A room-temperature and one-pot synthesis of ε-CF3-substituted amides via the copper-catalyzed trifluoromethylation of alkenes with redox-neutral remote amidation of aldehydes is described. This reaction is featured by an unprecedented 1,5-H atom abstraction from aldehydic C–H bonds by α-CF3-alkyl radicals resulting from the radical trifluoromethylation of alkenes, thus enabling a new possibility of
K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-Mediated Selective Trifluoromethylacylation and Trifluoromethylarylation of Alkenes under Transition-Metal-Free Conditions: Synthetic Scope and Mechanistic Studies
on and -arylation of alkenes with inexpensive CF3SO2Na and K2S2O8 in aqueous media has been developed, respectively, affording the highly chemoselective synthesis of CF3-functionalized chroman-4-ones and chromanes in satisfactory yields. Control experiments and DFT calculations indicate that the CF3SO2Na/K2S2O8 system is capable of trifluoromethylating the substrate of alkenes without a transition
Cu-Mediated Sulfonyl Radical-Enabled 5-<i>exo-trig</i> Cyclization of Alkenyl Aldehydes: Access to Sulfonylmethyl 1<i>H</i>-Indenes
作者:Jiabin Ni、Yu Xue、Liping Sun、Ao Zhang
DOI:10.1021/acs.joc.8b00341
日期:2018.4.20
An efficient method for the construction of sulfonylmethyl 1H-indenes via Cu(I)-mediated sulfonyl radical-enabled 5-exo-trigcyclization of alkenyl aldehydes has been developed for the first time. Mechanistic studies indicated that a radical addition–cyclization–elimination (RACE) process might be involved. The reaction features a relatively broad substrate scope, good annulation efficiency, and varying
Direct Intramolecular Conjugate Addition of Simple Alkenes to α,β-Unsaturated Carbonyls Catalyzed by Cu(OTf)<sub>2</sub>
作者:Yan Qin、Jian Lv、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1021/ol502373u
日期:2014.10.3
An unprecedented intramolecular conjugate addition of simple alkenes to α,β-unsaturated carbonyl compounds has been developed. A simple Lewis acid such as Cu(OTf)2 was found to effectively catalyze the reaction, and six- and five-membered cyclic products were obtained in moderate to high yields.
Visible-light induced generation of bifunctional nitrogen-centered radicals: a concise synthetic strategy to construct bicyclo[3.2.1] octane and azepane cores
A photocatalytic tandem cyclization of o-alkenylbenzaldehydes using pyridinium salts as the amination reagent is described. A variety of valuable seven-membered nitrogenous heterocyclic skeletons are prepared in modest to excellent yields in concise one-step. This transformation features mild reaction conditions and exceptional functional group tolerance. In addition, combining control experiments and density functional theory (DFT) calculations on the mechanism can explain the reaction selectivity.