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.
The effect of hydrogen bond on Brønsted acid-catalyzed intramolecular hydroamination of unfunctionalized olefins
作者:Ting-Ting Li、Gong-Qing Liu、Yu-Mei Wang、Bin Cui、Hui Sun、Yue-Ming Li
DOI:10.1016/j.tet.2015.07.003
日期:2015.9
and amino proton. This interaction also increased the nucleophilicity of the amino group. Thus, in the presence of 20 mol % of 2-(trifluoromethanesulfonamido)benzoic acid, intramolecular hydroamination of unfunctionalizedolefins gave the corresponding products in up to 95% isolated yields.
Trifluoroacetic acid-promoted intramolecular hydroamination of unfunctionalized olefins bearing electron-rich amino groups
作者:Gong-Qing Liu、Bin Cui、Hui Sun、Yue-Ming Li
DOI:10.1016/j.tet.2014.06.061
日期:2014.9
Trifluoroacetic acid was found to be effective in intramolecular hydroamination of unfunctionalizedolefins bearing electron-rich amino groups, and the corresponding N-heterocycles were obtained in good isolated yields. The scope of the substrates was investigated, and a possible reaction mechanism was proposed. Substituents on CC double bonds and amino groups of the substrates showed drastic effects
Cooperative effect in organocatalytic intramolecular hydroamination of unfunctionalized olefins
作者:Yu-Mei Wang、Ting-Ting Li、Gong-Qing Liu、Li Zhang、Lili Duan、Lin Li、Yue-Ming Li
DOI:10.1039/c3ra47060a
日期:——
The cooperative effect in organocatalytic hydroamination of unfunctionalizedolefins was reported. In the presence of 3-hydroxy-2-naphthoic acid, N-benzyl 4-penten-1-amines and 5-hexen-1-amines produced the intramolecular cyclization products in good isolated yields.