(<i>Z</i>)<i>-</i>Trifluoromethyl-Trisubstituted Alkenes or Isoxazolines: Divergent Pathways from the Same Allene
作者:Chaolun Liu、Glenn P. A. Yap、Casey A. Rowland、Marcus A. Tius
DOI:10.1021/acs.orglett.0c02546
日期:2020.9.18
protonation of trifluoromethyl allenes leads to tri- or tetrasubstituted alkenes with high (Z)-selectivity. Treatment of the same allenes with catalytic Au(I) initiates a reaction cascade that produces isoxazolines in high yield.
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
Synthesis of Perfluoroalkyl-Substituted Vinylcyclopropanes by Way of Enhanced Neighboring Group Participation
作者:Christopher B. Kelly、Michael A. Mercadante、Emma R. Carnaghan、Matthew J. Doherty、Diana C. Fager、John J. Hauck、Allyson E. MacInnis、Leon J. Tilley、Nicholas E. Leadbeater
DOI:10.1002/ejoc.201500565
日期:2015.7
homoallyl alcohols is disclosed. Destabilization of the cationic intermediate by the electron-withdrawing CF3 group greatly enhances neighboringgroupparticipation of the alkene, allowing ring closure to predominate. The reaction can be extended to the difluoromethyl and pentafluoroethyl group, enabling the preparation of a diverse array of fluoroalkyl-substituted vinylcyclopropanes.
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
A battery that includes a cathode, anode and an electrolytic solution containing an organic electrolyte solvent including a compound of the formula: R
1
—CO—NR
2
—OR
3
wherein R
1
is selected from alkanes, alkenes, alkynes, aryls and their substituted derivatives and perfluorinated analogues; R
2
is selected from alkanes, alkenes, alkynes, aryls and their substituted derivatives; R
3
is selected from alkanes, alkenes, alkynes, aryls and their substituted derivatives wherein the electrolyte is stable at voltages of greater than 4.0 volts.