Reaction of enamines with trifluoromethyl containing carbonyl reagents
作者:Dmitriy A. Sibgatulin、Tatyana E. Shubina、Aleksandr N. Kostyuk、Dmitriy M. Volochnyuk、Reinhard Schmutzler、Peter G. Jones、Aleksandr M. Pinchuk
DOI:10.1016/j.jfluchem.2009.10.014
日期:2010.2
The reaction of linear push–pull enamines bearing a methyl group at the α-position with a set of trifluoromethylated carbonyl compounds was investigated. It has been found that the reaction proceeds at the methyl group of the enamines. The first computational study of the reaction between push–pull enamines and strong electrophilic reagents was reported. Out of three pathways considered DFT and MP2
A facile method of trifluoroacylation of imidazoles, 1,3-thiazoles, and 1,3-oxazoles with trifluoroacetic anhydride resulted in a set of heterocyclic trifluoromethyl-containing ketones. Unlike common ketones, these compounds form stable hydrates and enter into noncatalytic ene reactions with terminal olefins affording the corresponding allyl alcohols.
Enantioselective Alkynylation of 2-Trifluoroacetyl Imidazoles Catalyzed by Bis-Cyclometalated Rhodium(III) Complexes Containing Pinene-Derived Ligands
作者:Yu Zheng、Klaus Harms、Lilu Zhang、Eric Meggers
DOI:10.1002/chem.201602372
日期:2016.8.16
Chiral rhodium(III) complexes containing two cyclometalating 2‐phenyl‐5,6‐(S,S)‐pinenopyridine ligands and two additional acetonitriles are introduced as excellent catalysts for the highly enantioselective alkynylation of 2‐trifluoroacetyl imidazoles. Whereas the ligand‐based chirality permits the straightforward synthesis of the complexes in a diastereomerically and enantiomerically pure fashion,
2-(Trifluoroacetyl)-1,3-azoles readily react with methyl acrylate and acrylonitrile under Baylis-Hillman reaction conditions to afford heterocyclic trifluoromethyl-containing allylic alcohols in 36-97% yields. The thus obtained Baylis-Hillman adducts readily undergo Michael addition reactions with various nucleophiles.