A Pd-catalyzed Overman rearrangement of α-fluoroalkylated allylic trichloroacetimidates has been developed. This reaction allows for an efficient synthesis of γ-fluoroalkylated allylic amine derivatives with excellent regio- and stereo-selectivities under mild conditions.
allyl/propargyl carbonates using bis(pinacolato)diboron (B2pin2) as a reactant is described. The reaction proceeds under relatively mild reaction conditions, providing conjugated gem-difluoroalkenes in moderate to good yields. Applications of the resulting 1,1-difluoro-1,3-dienes by [4 + 2] cycloadditionreactions with maleimide led to cyclic fluorinated products efficiently.
Novel reductive olefination mediated by Ti(O-i-Pr)4 and Ph3P. One-pot synthesis of trifluoromethylated trans-allylic alcohols
作者:Yanchang Shen、Yuming Zhang、Yuefen Zhou
DOI:10.1039/a806271d
日期:——
A novel reductive olefination mediated by Ti(O-i-Pr)4 and Ph3P and its application to the ‘one-pot’ synthesis of perfluoroalkylated trans-allylic alcohols are described.
Shen, Yanchang; Zhang, Yuming; Zhou, Yuefen, Journal of the Chemical Society. Perkin transactions I, 1999, # 12, p. 1759 - 1763
作者:Shen, Yanchang、Zhang, Yuming、Zhou, Yuefen
DOI:——
日期:——
Acid-Promoted Reaction of Trifluoromethylated Allyl Alcohols with Arenes. Stereoselective Synthesis of CF<sub>3</sub>-Alkenes and CF<sub>3</sub>-Indanes
作者:Anna N. Kazakova、Roman O. Iakovenko、Irina A. Boyarskaya、Valentine G. Nenajdenko、Aleksander V. Vasilyev
DOI:10.1021/acs.joc.5b01398
日期:2015.10.2
Reaction of 4-aryl-1,1,1-trifluorobut-3-en-2-ols [CF3-allyl alcohols, ArCH=CHCH(OH)CF3] with arenes under activation activation with anhydrous FeCl3 or FSO3H was studied. We found that the transformation led to trifluoromethylated alkenes [Ar(Ar')CHCH=CHCF3] or 1-trifluoromethylated indanes (CF3-indanes). The formation of these two types of reaction products strongly depends on the nudeophilicity of the starting arene and the electrophilicity of cationic intermediates generated from CF3-allyl alcohols under reaction conditions. Benzene, anisole, veratrole, and ortho-xylene lead exclusively to CF3-alkenes with an E-configuration. More pi-donating polyrnethylated arenes (pseudocumene, mesitylene) afford only CF3-indanes with a predominantly cis-orientation of substituents at positions 1 and 3 of the indane ring. Meta- and para-xylenes show an intermediate behavior; they may form both CF3-alkenes and/or CF3-indanes. The mechanisms of the investigated transformations are discussed.