Intramolecular Friedel-Crafts alkylation and chloroalkylation of 5-aryl-1,1,1-trifluoropentan-2-ones. A route to (trifluoromethyl)dihydronaphthalenes and (trifluoromethyl)tetrahydronaphthalenes
trifluoromethylalkene derivatives. By using readily available allyl metallics as nucleophilic coupling partner, the present reaction enables an expedient construction of structurally diversified CF2-bridged 1,5-dienes. Furthermore, the exquisite selectivity observed in this transformation is revealed to be based on the underlying mechanism that consists of a cascade of nucleophilic SN2′ defluorinative
An unprecedented γ-carboxylation of α-CF3 alkenes with CO2 is reported. This approach constitutes a rare example of using electrochemical methods to achieve regioselectivity complementary to conventional metal catalysis. Accordingly, using platinum plate as both a working cathode and a nonsacrificial anode in a user-friendly undivided cell under constant current conditions, the γ-carboxylation provides
Photoredox Generation of Carbon-Centered Radicals Enables the Construction of 1,1-Difluoroalkene Carbonyl Mimics
作者:Simon B. Lang、Rebecca J. Wiles、Christopher B. Kelly、Gary A. Molander
DOI:10.1002/anie.201709487
日期:2017.11.20
facile, scalable route to access functional‐group‐rich gem‐difluoroalkenes. Using visible‐light‐activated catalysts in conjunction with an arsenal of carbon‐radical precursors, an array of trifluoromethyl‐substituted alkenes undergoes radical defluorinative alkylation. Nonstabilized primary, secondary, and tertiary radicals can be used to install functional groups in a convergent manner, which would otherwise
SN2′ Defluorinative Allylation of Trifluoromethylalkenes with Allylsilanes
作者:Chuan Zhu、Chao Feng、Meng-Meng Sun、Haidong Liu
DOI:10.1055/a-1653-2685
日期:2022.2
allylation of trifluoromethylalkenes with readily available allylsilanes to access homoallyl gem-difluoroalkenes is reported. The reaction is triggered by a catalytic amount of TBAF, with the extruded fluoride in the reaction serving as a sustainable activator for organosilanes. The high efficiency, good functional group tolerance, and mild reaction conditions underline the potential of this method in synthetic