Dehydrogenation of Perfluoroalkyl Ketones by Using a Recyclable Oxoammonium Salt
作者:Trevor A. Hamlin、Christopher B. Kelly、Nicholas E. Leadbeater
DOI:10.1002/ejoc.201300392
日期:2013.6
A novel dehydrogenation reaction of perfluoroalkyl ketones by the oxoammoniumsalt 4-acetylamino-2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate (4-NHAc-TEMPO+BF4–, Bobbitt's salt, 1) is described. The reaction proceeds under mildly basic conditions and appears to be unique to perfluoroalkyl ketones. A proposed mechanism for this unusual transformation is given. The byproduct of the reaction
Synthesis of trifluoromethyl derivatives of pyrrole. Reaction of , -unsaturated trifluoromethyl ketones with sodium cyanide
作者:V. G. Nenajdenko、S. V. Druzhinin、E. S. Balenkova
DOI:10.1023/b:rucb.0000012372.68456.6f
日期:2003.11
An efficient preparative procedure was developed for the synthesis of 5-hydroxy-5-trifluoromethyl-2-pyrrolidones by the reaction of α,β-unsaturated trifluoromethylketones with sodium cyanide. Dehydration of these reaction products under mild conditions afforded previously unknown 5-trifluoromethyl-3-pyrrolin-2-ones.
Reaction of , -unsaturated trifluoromethyl ketones with cyclic enamines
作者:V. G. Nenajdenko、S. V. Druzhinin、E. S. Balenkova
DOI:10.1023/b:rucb.0000030821.56661.44
日期:2004.2
The reactions of α,β-unsaturated trifluoromethyl ketones containing aromatic and heteroaromatic substituents with 1-morpholinocyclopentene, 1-morpholinocyclohexene, and 1-methyl-4-morpholino-1,2,5,6-tetrahydropyridine were studied. The reactions proceeded stereospecifically to give the corresponding bicyclo[3.2.1]octane, bicyclo[3.3.1]nonane, and azabicyclo[3.3.1]nonane derivatives.
Organocatalytic Asymmetric Benzylation and Aldol-Hemiacetalization of α,β-Unsaturated Trifluoromethyl Ketones: Efficient Enantioselective Construction of 3,4-Dihydroisocoumarins
作者:Jindian Duan、Yuyu Cheng、Jing Cheng、Rou Li、Pengfei Li
DOI:10.1002/chem.201604920
日期:2017.1.12
developed for the organocatalytic enantioselective benzylation and aldol‐hemiacetalization of α,β‐unsaturated trifluoromethyl ketones with toluene derivatives in the presence of a tertiary amine‐thiourea catalyst. This method represents a facile and efficient strategy for the asymmetric synthesis of opticallyactive 3,4‐dihydroisocoumarins bearing a trifluoromethylated tetrasubstituted carbon stereocenter
The first catalytic enantioselectiveFriedel–Craftsalkylation of indoles with α,β-unsaturated trifluoromethyl ketones has been accomplished. The reaction was achieved in the presence of the Dy(OTf)3/Pybox complex, producing the desired products in high yields (up to 99%) with good enantioselectivities (up to 86% ee). The absolute stereochemistry of the resulting adducts was determined by X-ray analysis