Novel synthesis of 2,2,2-trifluoroethyl compounds from homoallylic alcohols: a copper(I) iodide-initiated trifluoromethyl–dehydroxylation process
摘要:
Benzyl, prop-2-ynyl and allyl chlorodifluoroacetates 3a, bromodifluoroacetates 3b or fluorosulfonyl-difluoroacetates 3c, when decomposed in the presence of 1 equivalent of copper(I) iodide at an appropriate temperature in dimethylformamide, gave the corresponding trifluoromethyl derivatives in good to excellent yields. The products can also be obtained directly by ester exchange of XCF2CO2Et (X = FSO2, Cl, Br) 6 and the corresponding alcohols in the presence of KF and Cul. A trifluoromethylation-dehydroxylation mechanism, initiated by Cul, is proposed.
Synthesis of trifluoromethylated compounds from alcohols via alkoxydiphenylphosphines
作者:Jun-Li Li、Xian-Jin Yang、Yanan Wang、Jin-Tao Liu
DOI:10.1016/j.jfluchem.2015.08.011
日期:2015.10
The transformation of hydroxyl group in benzyl or allyl alcohols to trifluoromethyl was achieved via the reaction of the corresponding alkyloxydiphenylphosphine and CuCF3, generated in situ from methyl fluorosulfonyldifluoroacetate and CuI, under mild conditions. A plausible mechanism was proposed on the basis of experimental results.
Procédé de perfluoroalkylation de dérivés aromatiques
申请人:RHONE-POULENC CHIMIE
公开号:EP0206951A2
公开(公告)日:1986-12-30
La présente invention concerne un procédé de perfluoroalkylation de dérivés aromatiques par réaction, dans une première étape, dudit dérivé aromatique du dioxyde de soufre et d'un métal choisi parmi le zinc, l'aluminium, le manganèse, le cadmium, le magnésium, l'étain, le fer, le nickel et le cobalt dans un solvant aprotique polaire suivie, dans une deuxième étape, par l'addition d'un bromure ou d'un iodure de perfluoroalkyle.
The reactions of copper-dibromodifluoromethane-amide systems with alcohols
作者:James H. Clark、Martin A. McClinton、Robert J. Blade
DOI:10.1016/s0022-1139(00)82418-5
日期:1992.11
1,1,1-Trifluoro-2-arylethanes can be prepared by the trifluoromethyldehydroxylation of benzYl alcohols using the copper-dibromodifluoromethane-amide reaction system, although the yields are low. The mechanism of the reaction may involve chelation of the substrate to copper so that alpha-substituted benzyl alcohols and most other alcohols are unreactive.
ANTIFUNGAL AZOLE DERIVATIVES HAVING A FLUORINATED VINYL GROUP AND PROCESS FOR PREPARING SAME
申请人:Korea Research Institute of Chemical Technology