Enantioselective Friedel–Crafts reactions between phenols and N-tosylaldimines catalyzed by a leucine-derived bifunctional catalyst
作者:Guo-Xing Li、Jin Qu
DOI:10.1039/c2cc31735d
日期:——
Enantioselective FriedelâCrafts reactions between phenols and N-tosylaldimines were developed using a bifunctional catalyst readily prepared from L-leucine. The chiral benzylic amine products were obtained in high yields (up to 96% yield) and good to high enantiomeric excesses (up to 95% ee).
Chiral‐Directing‐Group‐Assisted Rhodium(III)‐Catalyzed Asymmetric Addition of Inert Arene C−H Bond to Aldimines with Subsequent Intramolecular Cyclization
作者:Xuhong Cai、Wenkun Chen、Ruifang Nie、Jun Wang
DOI:10.1002/chem.202103319
日期:2021.12
An asymmetric rhodium(III)-catalyzed C−H bond addition to aldimines followed by subsequent intramolecular cyclization to form chiral isoindolinones has been achieved by using a chiral directing group. Various substituted benzamides and aldimines have been smoothly transformed to the corresponding products in up to 68 % yield with up to 93 % ee.
A Mannich/cyclization cascade process for the asymmetric synthesis of spirocyclic thioimidazolidineoxindoles
作者:Hao Cai、Yu Zhou、Dong Zhang、Jinyi Xu、Hong Liu
DOI:10.1039/c4cc06000h
日期:——
An asymmetric cascade Mannich/cyclization reaction between 3-isothiocyanato-oxindoles and sulfimides has been developed for the synthesis of spirocyclic thioimidazolidineoxindoles.
NHC ligand-enabled Ni-catalyzed reductive coupling of alkynes and imines using isopropanol as a reductant
作者:Wei-Wei Yao、Ran Li、Jiang-Fei Li、Juan Sun、Mengchun Ye
DOI:10.1039/c9gc00653b
日期:——
A nickel-catalyzed reductive coupling of alkynes and imines using readily available isopropanol as the reducing agent was developed. The use of a sterically bulky and electron-rich carbene ligand (AnIPr) significantly promotes the reaction, providing various multi-substituted allylic amines in 23–89% yield and the corresponding chiral ligand (AnIPr-3) can afford the products in 51–95% ee.