Regioselective Copper(II)-Mediated Bromoamination of Unfunctionalized Olefins: An Efficient Route to N-Heterocyclic Compounds
作者:Gong-Qing Liu、Zhen-Ying Ding、Li Zhang、Ting-Ting Li、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1002/adsc.201301125
日期:2014.7.7
Bromoamination of unfunctionalized olefins was realized under mild conditions using copper(II) bromide (CuBr2) as both reaction promoter and bromine source. The reactions could be carried out under open air at ambient temperature, and both N‐alkylated and N‐tosylated substrates could be converted to the corresponding N‐heterocyclic compounds in high regioselectivity and good isolated yields. A variety
ortho-C-alkylation of unprotected anilines with a variety of styrenes and alkenes using a univalent cationic indium(I) catalyst is reported. Mechanistic studies revealed that the reaction likely proceeds via a tandem hydroamination/Hofmann–Martius rearrangement. The high compatibility between the cationic indium(I) complex and primary anilines led us to develop an In(I)+-catalyzed hydroamination of alkenes
Ligand acceleration in ZnI2-catalyzed intramolecular hydroamination of unfunctionalized olefins
作者:Gong-Qing Liu、Wei Li、Yu-Mei Wang、Zhen-Ying Ding、Yue-Ming Li
DOI:10.1016/j.tetlet.2012.06.033
日期:2012.8
studied. Preliminary results indicated that both steric and electronic factors are crucial for this Lewisacid-promotedreaction. ZnI2 gave the most promising results and the reactivity could be further increased upon addition of a suitable ligand. Up to 95% isolated yields were obtained when the reactions were carried out in 1,4-dioxane in the presence of 10 mol % of ZnI2 and 8-hydroxyquinoline.
Inter- and Intramolecular Hydroamination of Unactivated Alkenes Catalysed by a Combination of Copper and Silver Salts: The Unveiling of a Brønstedt Acid Catalysis
The combined use of a copper halide, a silver salt and a phosphane ligand was applied for the catalysis of inter- and intramolecularhydroamination of alkenes. The reactions of unactivated olefins with nitrogen substrates were investigated. Mechanistic investigations demonstrated that the catalytic system generated a Brønsted acid which appeared to be the prominent catalytic species.
A New Method for Intramolecular Chloroamination of Unfunctionalized Olefins
作者:Gong-Qing Liu、Wei Li、Yue-Ming Li
DOI:10.1002/adsc.201200352
日期:2013.1.25
A newmethod for the intramolecularchloroamination of unfunctionalizedolefins is reported. The reactions were carried out at room temperature for 3 h using hydrated copper(II) chloride as both promoter and chlorine source, and the corresponding vincinal haloamines were obtained in good isolated yields.