Synthesis of Functionalized Indoles with a Trifluoromethyl-Substituted Stereogenic Tertiary Carbon Atom Through an Enantioselective Friedel-Crafts Alkylation with β-Trifluoromethyl-α,β-enones
作者:Gonzalo Blay、Isabel Fernández、M. Carmen Muñoz、José R. Pedro、Carlos Vila
DOI:10.1002/chem.201000568
日期:——
tert‐butoxide catalyze the Friedel–Crafts alkylation reaction of indoles with β‐trifluoromethyl‐α,β‐unsaturated ketones to give functionalizedindoles with an asymmetric tertiary carboncenter attached to a trifluoromethyl group. The reaction can be applied to a large number of substituted α‐trifluoromethyl enones and substituted indoles. The expected products were obtained with good yields and ees of
practical phosphine‐catalyzed vicinal difunctionalization of β‐fluoroalkyl α,β‐enones with TMSN3 has been developed. Using dppb as the catalyst, the reaction worked efficiently to yield various β‐amino α‐diazocarbonyl compounds in high yields (up to 94 %). This work marks the first efficient construction of α‐diazocarbonyl compounds by phosphine catalysis. Meanwhile, the asymmetric variant induced by the
contiguous three stereocenters has been a long-standing challenging task in organic synthesis. Herein we present a phoshine-catalyzed highly regio-, diastereo- and enantioselective [3+2] cycloaddition of γ-substitutedallenoates with β-perfluoroalkyl enones, delivering a wide range of densely functionalized perfluoroalkylated cyclopentenes with three contiguous chiral stereocenters.
Synthetic Applications of α-Fluoroalkylated Enones. 1. Use as Dienophiles in Diels−Alder Cycloadditions
作者:Julia Leuger、Gaëlle Blond、Roland Fröhlich、Thierry Billard、Günter Haufe、Bernard R. Langlois
DOI:10.1021/jo052567+
日期:2006.3.31
beta-Fluoroalkylated enones are efficient dienophiles in Diels-Alder cycloadditions to prepare various fluorinated cylic compounds. However, the presence of the fluoroalkyl moiety modifies the reactivity and the selectivity of these cycloadditions.
Reactivity of Stable Trifluoroacetaldehyde Hemiaminals. 1. An Unexpected Reaction with Enolizable Carbonyl Compounds
作者:Gaëlle Blond、Thierry Billard、Bernard R. Langlois
DOI:10.1021/jo015587u
日期:2001.7.1
In the presence of enolizable carbonyl compounds, hemiaminals of fluoral and related polyfluoro-aldehydes behave as equivalents of fluoroalkyl iminium compounds and provide beta -polyfluoroalkyl beta -dialkylamino ketones, which are easily transformed, under acidic conditions, into beta -polyfluoroalkylenones.