Perfluoroalkyl migration in the rearrangement of 4-perfluoroalkyl-4-quinols
摘要:
Heating a DMSO solution of 4-(perfluoro-n-alkyl)-4-hydroxy-2,5-cyclohexadien-1-one (4-perfluoroalkyl-4-quinols) in the presence of a catalytic amount of base brought about 1,2-migration of the perfluoroalkyl group to give 2-(perfluoro-n-alkyl)hydroquinone or 5-(perfluoro-n-alkyl)-2-cyclohexene-1,4-dione depending upon the substitution pattern of the quinol. The similar rearrangement of 4-perfluoroisopropyl-4-hydroxy-2,5-cyclohexadien-1-one occurred very smoothly at room temperature under the basic conditions. 5-Hydroxy-4-methyl-5-perfluorooctyl-1-propyl-3-pyrrolin-2-one underwent the base-induced rearrangement to afford a perfluorooctylated succinimide derivative. On the other hand, 5-hydroxy-3-methyl-5-perfluorooctyl-1-propyl-3-pyrrolin-2-one and 5-hydroxy-1-isobutyl-5-perfluorooctyl-3-pyrrolin-2-one did not suffer any rearrangement, although their structures were very similar to the 4-methylated one.
Compounds of formula ##STR1## where n is an integer from 1 to 12, R and R.sub.1 are the same or different and are hydrogen or C.sub.1 to C.sub.6 linear or branched alkyl as well as their physiologically active salts and amides thereof and the enantiomers, mixtures and racemates are disclosed. Intermediates useful in preparing the above compounds are also disclosed as are processes for preparing these compounds.
Preparation of Perfluoroalkyl Ketones by the Reaction of Perfluoroalkyllithiums with Esters
作者:Hidemitsu Uno、Yasukazu Shiraishi、Hitomi Suzuki
DOI:10.1246/bcsj.62.2636
日期:1989.8
A variety of esters react with perfluoroalkyllithiums in situ generated from perfluoroalkyl iodides and methyllithium to give perfluoroalkyl ketones in good yields. Perfluoroalkyllithiums add to α, β-unsaturated esters only in the 1,2-addition mode even in the presence of copper salt. Exception was observed in the reaction with maleates where perfluoroalkylated succinic esters and normal 1,2-addition
Perfluoroalkyl-thwarted Rearrangement of Quinol Esters. Formation of Catechol Derivatives via 1,3-Migration of Acyloxyl Group
作者:Hitomi Suzuki、Yasukazu Shiraishi、Kazuhiro Shimokawa、Hidemitsu Uno
DOI:10.1246/cl.1988.127
日期:1988.1.5
Treatment of 4-perfluoroalkyl-4-quinols with acetic anhydride-sulfuric acid was found to lead to 1,2- and 1,3-migration of acetoxyl group in initially formed quinol acetates followed by aromatization to give a mixture of 4-perfluoroalkylresorcinol diacetate and 4-perfluoroalkylcatechol diacetate.