Modularly Evolved 2-AminoDMAP/Squaramides as Highly Active Bifunctional Organocatalysts in Michael Addition
作者:Murat Işık、M. Yagiz Unver、Cihangir Tanyeli
DOI:10.1021/jo5022597
日期:2015.1.16
We report a new family of chiral bifunctional acid/base type organocatalysts, 2-aminoDMAP/Squaramides, which are proved to be highly active (1 mol % cat. loading) promoters in conjugate addition of dibenzoylmethane to various trans-β-nitroalkenes. Steric demand of the catalysts was clearly seen by a set-by-set modulation of the squaramide unit through electronic and steric factors. The synergistic
Disclosed is a process of carrying out a Michael reaction with recovery of the catalyst, where a compound of formula (1):
is reacted with a compound of formula (2):
in the presence of a catalyst of formula (4):
where the compounds of formulae (1) and (2) undergo a Michael reaction.
Disclosed is a process of carrying out a Michael reaction with recovery of the catalyst, where a compound of formula (1):
is reacted with a compound of formula (2):
in the presence of a catalyst of formula (4):
where the compounds of formulae (1) and (2) undergo a Michael reaction.
Development of Mefloquine-Based Bifunctional Secondary Amine Organocatalysts for Enantioselective Michael and Friedel–Crafts Reactions
作者:Dawid J. Kucharski、Radosław Suchanek、Rafał Kowalczyk、Przemysław J. Boratyński
DOI:10.1021/acs.joc.3c01791
日期:2024.1.5
The chiral framework based on 11-aminomefloquine has been utilized for the first time to construct bifunctional organocatalysts. These catalysts demonstrate high enantioselectivity in both Michaeladditions and Friedel–Crafts reactions across a variety of substrates, achieving up to >99% ee. The distinctive feature is the incorporation of a secondary amine group, offering unique tight hydrogen-bonding