The role of F–N reagent and reaction conditions on fluoro functionalisation of substituted phenols
作者:Igor Pravst、Maja Papež Iskra、Marjan Jereb、Marko Zupan、Stojan Stavber
DOI:10.1016/j.tet.2006.02.051
日期:2006.5
The effect of steric interactions on the regioselectivity of fluorination of para alkyl substituted phenols was investigated and the strong effect of size of the alkyl substituent, the structure of the F–N reagent and the solvent on the site of fluorination was established. The course of reaction obeyed a second order rate equation, while the fluorination process required higher ΔH≠ activation than
Fluorination of 4-alkyl-substituted phenols and aromatic ethers with fluoroxy and N-F reagents: Cesium fluoroxysulfate and N-fluoro-1,4-diazonia-bicyclo[2.2.2]octane dication salts case
作者:Igor Pravst、Stojan Stavber
DOI:10.1016/j.jfluchem.2013.07.002
日期:2013.12
were comparatively fluorinated with electrophilic fluorinating reagents such as cesiumfluoroxysulfate (CFS), Selectfluor™ F-TEDA-BF4, and Accufluor™ NFTh in MeCN or MeOH. Reactions resulted in the formation of three types of products: 2-fluoro-4-alkyl-substituted corresponding compounds (5) as a result of ortho fluorination process, 4-alkyl-4-fluoro-cyclohexa-2,5-dienone compounds (6), resulting after
Efficient Synthesis of 4-Fluorocyclohexa-2,5-dienone Derivatives Using N-Fluoro-1,4-diazoniabicyclo[2.2.2]octane Salt Analogues
作者:Stojan Stavber、Marjan Jereb、Marko Zupan
DOI:10.1055/s-1999-2840
日期:1999.9
4-Fluorocyclohexa-2,5-dienone derivatives were obtained in high yield by reaction of para substituted phenols with 1-fluoro-4-chloromethyl-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoro-borate) (1a, SelectfluorTM F-TEDA-BF4) or its 4-hydroxy analogue (1b, AccufluorTM NFTh) in acetonitrile. Estrogen steroids were readily converted to 10β-fluoro-1,4-estradiene-3-one derivatives in high yields.