Halogenation of 1-trifluoromethyl enamines: A new and efficient synthesis of α-bromo- and α-iodo-trifluoromethyl ketones
摘要:
Treatment of the 1-trifluoromethyl enamines 1a-d with bromine or iodine results in the formation of the corresponding iminium salts. Treatment of any of these salts with methanol results in the formation of the corresponding alpha-halo-trifluoromethyl ketones.
Palladium-catalyzed amination of 2,3,3-trifluoroallyl esters: synthesis of trifluoromethylenamines via an intramolecular fluorine shift and CF3 group construction
Concise stereoselective synthesis of 1-perfluoroalkyl enamines via the addition of N-lithiated amines to enol ethers and their subsequent metalation to form new functionalized enamines
作者:Jean-Pierre Bégué、Danièle Bonnet-Delpon、Denis Bouvet、Michael H. Rock
DOI:10.1039/a801243a
日期:——
Addition of lithium amides derived from a range of cyclic, sterically demanding, and chiral amines, to trifluoromethyl (Z)-enol ethers 1 and 4, provides stereoselectively the corresponding (Z)-enamines 3a–e and 7 in good yields. This reaction has been extended to the perfluoroalkyl and chlorofluoroalkyl enol ethers (CF2Cl, C2F5). The enamines can react with ButLi to give vinylic anions and, after quenching with aldehydes and ethyl chloroformate, provide new functionalized enamines 12–16.
Z-trifluoromethyl thioenol ethers, enol ethers, and enamines; reactivity towards organolithium reagents
作者:Jean-Pierre Bégué、Danièle Bonnet-Delpon、Michael H. Rock
DOI:10.1016/0040-4039(95)02118-3
日期:1996.1
conjugated with an unsaturation in the β-position undergo addition/elimination reactions with organolithium reagents to yield the corresponding trifluoromethyl alkenes while preserving the geometry of the double bond. Trifluoromethyl enamines exhibit a different reactivitytowards organolithium reagents with a vinyl anion being formed in preference to addition/elimination products.
A New Synthesis of 1-(Trifluoromethyl)enamines and 1- (Trifluoromethyl)alkylamines
作者:Jean-Pierre Bégué、Dany Mesureur
DOI:10.1055/s-1989-27237
日期:——
Several 1-(trifluoromethyl)enamines were prepared by heating trifluoroacetamides with alkylidenetriphenylphosphoranes in THF or benzene. The product enamines can be reduced (H2, Pd/C) to 1-(trifluoromethyl)alkylamines.
Palladium-catalyzed cross-coupling reaction of β-amino-β-trifluoromethylvinyl bromides 7 and 8 with boronic acids has been achieved to afford new stable β,β-disubstituted α-trifluoromethyl enamines 12 and 13, which can be used as masked ketones. The ketone function can be released in acidic medium.