The effect of substituents and operating conditions on the electrochemical fluorination of alkyl phenylacetates in Et3N·4HF medium
作者:N. Ilayaraja、A. Manivel、D. Velayutham、M. Noel
DOI:10.1016/j.jfluchem.2007.10.007
日期:2008.3
Selective electrochemical fluorination of alkyl phenylacetates (Ph–CH2–COOR, where R is methyl, ethyl, n-propyl, n-butyl, i-propyl and sec-butyl) under galvanostatic conditions were reported in Et3N·4HF medium. Preparative electrolysis experiments were carried out both in pre-electrolysed dry Et3N·4HF and the same electrolyte medium without pre-electrolysis. Very little hydrolysed fluorinated products
An object of the present invention is to provide a novel substance that has a high reactivity as a fluorinating agent, is effectively used in various fluorination reactions, and is safely handled even in air. As the solution for achieving this object, the present invention provides a complex obtained by reacting bromine trifluoride with at least one metal halide selected from the group consisting of halogenated metals and halogenated hydrogen metals in a nonpolar solvent. This complex serves as a fluorinating agent that provides excellent fluorination performance and that is stable in air.
An object of the present invention is to provide a novel substance that has a high reactivity as a fluorinating agent, is effectively used in various fluorination reactions, and is safely handled even in air. As the solution for achieving this object, the present invention provides a complex obtained by reacting bromine trifluoride with at least one metal halide selected from the group consisting of halogenated metals and halogenated hydrogen metals in a nonpolar solvent. This complex serves as a fluorinating agent that provides excellent fluorination performance and that is stable in air.
IF5-pyridine-HF, an air- and moisture-stable solid, can be used as a fluorination reagent for the introduction of fluorine atoms to the alpha-position of the sulfur atom in sulfides. The desulfurizing-fluorination reactions of benzylic sulfides, thioacetals, and 2-(methylthio)-1,3-dithiane derivatives were also performed using this reagent. (C) 2012 Elsevier Ltd. All rights reserved.
The Guareschi–Thorpe Cyclization Revisited – An Efficient Synthesis of Substituted 2,6-Dihydroxypyridines and 2,6-Dichloropyridines
cyclization of β-keto esters and 2-cyanoacetamide to allow the synthesis of substituted pyridones in good to excellent yields. The chlorination of DBU salts of pyridones with POCl3 in the presence of a quaternary ammonium salt under standard atmospheric reflux conditions as opposed to the typical pressure equipment led to high yields of substituted 2,6-dichloropyridines.