Amino acids derived chiral bifunctional (thio)urea tertiary-amines catalyzed asymmetric henry reaction of α-trifluoromethy ketones
作者:Xiangyu Meng、Yueyang Luo、Gang Zhao
DOI:10.1016/j.tetlet.2020.152485
日期:2020.11
An asymmetric Henry reaction of α-trifluoromethyl ketones with nitroalkanes afforded α-trifluoromethyl-β-nitro alcohols catalyzed by novel bifunctional (thio)urea tertiary-amines derived from amino acids, in good yields with high enantioselectivities, which could be converted into promising structure motifs in pharmaceutical chemistry.
Bianthryl-based organocatalysts for the asymmetric Henry reaction of fluoroketones
作者:Jan Otevrel、David Svestka、Pavel Bobal
DOI:10.1039/c9ob00884e
日期:——
catalytic system based on bianthrylbis(thiourea) for the asymmetric Henry reaction of fluoroketones and nitroalkanes that resulted from the screening of a library containing 31 chiral non-racemic organocatalysts. The corresponding adducts were isolated in up to 6 times shorter reaction time in comparison with the previously published organocatalysts. High levels of stereocontrol have been generally observed
A highly anti-selectivecatalyticasymmetricnitroaldolreaction of trifluoromethyl ketones based on Nd/Na and Pr/Na heterobimetallic catalysts was developed. These catalysts function as heterogeneous catalysts to engage nitroethane and a range of trifluoromethyl ketones in a stereoselective assembly to afford CF3-appended vic-nitroalkanols that could be readily converted to enantioenriched vic-amino