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.
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 the formula
where n is an integer from 1 to 12, R and R₁ are the same or different and are hydrogen or C₁ to C₆ 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.