Synthesis of Trifluoromethyl-allenes by Gold-Catalyzed Rearrangement of Propargyl Benzyl Ethers
作者:Arnaud Boreux、Geoffroy H. Lonca、Olivier Riant、Fabien Gagosz
DOI:10.1021/acs.orglett.6b02636
日期:2016.10.7
A new method for the synthesis of trifluoromethyl-allenes from easily accessible α-trifluoromethyl-propargyl benzylether derivatives following a gold-catalyzed intramolecular hydride transfer has been developed. Various di- and trisubstituted trifluoromethyl-allenes were obtained in good to excellent yields.
Nickel-Catalyzed Alkyl-Alkyl Cross-Couplings of Fluorinated Secondary Electrophiles: A General Approach to the Synthesis of Compounds having a Perfluoroalkyl Substituent
作者:Yufan Liang、Gregory C. Fu
DOI:10.1002/anie.201503297
日期:2015.7.27
to a tertiary carbon atom by using an alkyl–alkyl cross‐coupling. A nickel catalyst derived from NiCl2⋅glyme and a pybox ligand achieves the coupling of a wide range of fluorinated alkyl halides with alkylzinc reagents at roomtemperature. A broad array of functional groups is compatible with the reaction conditions, and highly selective couplings can be achieved on the basis of differing levels of
atom efficient ‘trifluoroacetic ester/ketone metathesis’ has been sincerely witnessed. Enolizable alkyl (at least two non-hydrogen atoms) aryl ketones were found to react readily with ethyl trifluoroacetate under the promotion of NaH to afford trifluoroacetic ester/ketone exchange products, trifluoromethyl ketones (TFMKs), and aromatic acid esters, which were quite different from the general Claisen
Synthesis of Trifluoromethyl Ketones via Tandem Claisen Condensation and Retro-Claisen C–C Bond-Cleavage Reaction
作者:Dongmei Yang、Yuhan Zhou、Na Xue、Jingping Qu
DOI:10.1021/jo400280p
日期:2013.4.19
builds on the use of a tandem process involving Claisen condensation and retro-Claisen C–C bond cleavage reaction. Enolizable alkyl phenyl ketones were found to react readily with ethyl trifuoroacetate under the promotion of NaH to afford trifluoroacetic ester/ketone exchange products, trifluoromethyl ketones, which were quite different from the general Claisen condensation products, β-diketones. This
DIASTEREOSELECTIVE REDUCTION OF PERFLUQROALKYLATED α,β-UNSATURATED KETONES WITH BAKER’S YEAST
作者:Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1246/cl.1984.587
日期:1984.4.5
The differentiation of a fluorinated group in the molecule with active fermenting yeast and the doubleasymmetricinduction in some perfluoroalkylated α,β-unsaturated ketones are described.