Synthesis of 4-amino-1,2,3,4-tetrahydropyridine derivatives by intramolecular nucleophilic addition of tertiary enamides to in-situ generated imines
作者:Shuo Tong、Xu Yang、De-Xian Wang、Liang Zhao、Jieping Zhu、Mei-Xiang Wang
DOI:10.1016/j.tet.2012.05.108
日期:2012.8
reactivity of stable tertiaryenamides in nucleophilic addition reaction with various in-situ generated imines was explored. Under very mild conditions, formyl-bearing tertiaryenamides reacted with both aromatic and aliphatic amines to form imine intermediates. In the absence or presence of p-toluenesulfonic acid as a catalyst, intramolecular nucleophilic addition of enamide to imine functionality
Catalytic Enantioselective Synthesis of 4-Amino-1,2,3,4-tetrahydropyridine Derivatives from Intramolecular Nucleophilic Addition Reaction of Tertiary Enamides
作者:Shuo Tong、Mei-Xiang Wang
DOI:10.1055/s-0037-1610384
日期:2019.3
A general and efficient method for the synthesis of highly enantiopure 4-amino-1,2,3,4-tetradydropyridine derivatives based on chiral phosphoric acid catalyzed intramolecular nucleophilic addition of tertiary enamides to imines has been developed. We have also demonstrated a substrate engineering strategy to significantly improve the enantioselectivity of asymmetric catalysis
Enantioselective Synthesis of 4-Hydroxytetrahydropyridine Derivatives by Intramolecular Addition of Tertiary Enamides to Aldehydes
作者:Shuo Tong、De-Xian Wang、Liang Zhao、Jieping Zhu、Mei-Xiang Wang
DOI:10.1002/anie.201200459
日期:2012.4.27
Stable tertiaryenamides and enecarbamates undergo highly enantioselectiveintramolecular nucleophilic addition to aldehyde units catalyzed by chiral binol–Ti complexes under mild conditions to produce the title compounds in up to 99.5 % or greater enantiomeric excess. A positive nonlinear effect was detected and the formation of binol–Ti aggregates suggests an intricate asymmetric catalytic pathway