Oxy-Cope rearrangements of fluorinated divinylcyclohexanols: a modular method for the construction of selectively fluorinated cyclic ketones
作者:Gianluca Dimartino、Jonathan M. Percy、Neil S. Spencer、Thomas Gelbrich、Michael B. Hursthouse、Mark E. Light
DOI:10.1039/a908450i
日期:——
Oxy-Cope rearrangements of fluorinated divinylcyclohexanols afford access to cyclodecenones containing from two to five fluorine atoms.
氟化二乙烯基环己醇的Oxy-Cope重排提供了含有2至5个氟原子的环癸烯酮。
Syntheses of selectively fluorinated cyclodecenones: the first deployment of the neutral oxy-Cope rearrangement in organofluorine chemistry
作者:Gianluca DiMartino、Michael B. Hursthouse、Mark E. Light、Jonathan M. Percy、Neil S. Spencer、Malcolm Tolley
DOI:10.1039/b311261f
日期:——
Metallated haloalkenes were used to open epoxides in moderate to good yield. The homoallylic alcohols obtained underwent Swern oxidation to afford three γ,γ-difluorinated β,γ-enones, which reacted with either vinyllithium, 2-lithio-2H-dihydropyran or another metallated haloalkene to afford substituted trans-1,2-divinylcyclohexanols of different degrees of stability. These intermediates underwent neutral thermal oxy-Cope rearrangements when heated in xylene in Ace® tubes. The first-formed enols ketonised without loss of HF to afford a range of cyclodecenones in moderate to good yield; X-ray crystallography was used extensively for product characterisation. All substrates rearranged more rapidly than a cis/trans mixture of 1,2-divinylcyclohexanols.