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.
Asymmetric Henry reaction of trifluoromethyl ketone and aldehyde using Cu(II)-complex: computational study offers the origin of enantioselectivity with varied size of catalysts
作者:Anjan Das、Manoj K. Choudhary、Rukhsana I. Kureshy、Kalyanashis Jana、Shailesh Verma、Noor-ul H. Khan、Sayed H.R. Abdi、Hari C. Bajaj、Bishwajit Ganguly
DOI:10.1016/j.tet.2015.06.033
日期:2015.8
Chiral ligand 3 was synthesised from inexpensive and readily available (1R,2R)-(+)-1,2-diphenyl-1,2-diaminoethane and tert-butylbromoacetate. In situ generated complex obtained by the reaction of ligand 3 with copper triflate was used as catalyst for asymmetricHenry reaction of trifluoromethyl ketone having different substituents in the aromatic ring with nitromethane at 0 °C in presence of N,N-DIPEA
Synthesis of chiral tertiary trifluoromethyl alcohols by asymmetric nitroaldol reaction with a Cu(ii)-bisoxazolidine catalyst
作者:Hanhui Xu、Christian Wolf
DOI:10.1039/c0cc02378g
日期:——
A highly enantioselective and diastereoselectivecopper(II)-bisoxazolidine catalyzednitroaldolreaction with aliphatic and aromatic trifluoromethyl ketones is described.
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