Fluorination with CsSO4F. Part 21. Effect of the structure of alkene and alcohol on stereochemistry and relative rate of fluoroalkoxylation
作者:Stojan Stavber、Tjaša Sotler-Pečan、Marko Zupan
DOI:10.1016/s0040-4020(01)89573-9
日期:1994.1
stereochemistry of the reaction depends on the ring size of the substrate and on the structure of the alcohol, and is syn predominant in the case of fluorination of five-, anti predominant in six-, and slightly to nearly exclusively syn predominant in seven-membered ring benzocycloalkene analogues. The relativerates measured for methoxy-fluorinations of a set of seven phenyl-substituted alkenes with
A mild, selective method for preparation of vicinal fluoro ethers using “F-Teda-BF4”
作者:Stojan Stavber、Tjasa Sotler、Marko Zupan
DOI:10.1016/s0040-4039(00)79977-1
日期:1994.2
Vicinal alkoxy fluorides are efficiently formed by room temperature reaction of phenyl substituted alkenes with commercially available 1-chloromethyl-4-fluoro-1,4-diazobicyclo[2.2.2]octane bis tetrafluoroborate (Selectfluor(TM) F-Teda BF4) in CH3CN in the presence of various alcohols. The reaction follows Markovnikov-type regioselectivity, while stereoselectivity in the case of phenyl substituted benzocyclenes strongly depends on the ring size and the structure of the alcohol.
1-Fluoro-4-hydroxy-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) as a new, effective reagent for selective fluorofunctionalisation of alkenes under mild reaction conditions
作者:Stojan Stavber、Marko Zupan、Andrew J. Poss、George A. Shia
DOI:10.1016/00404-0399(50)1337-h
日期:1995.9
1-Fluoro-4-hydroxy-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (Accufluor(TM) NFTh) is confirmed as a highly effective reagent for introducing a fluorine atom into organic molecules across a phenyl-substituted carbon-carbon double bond. Quantitative and Markovnikov-type regioselective formation of vicinal fluoro-hydroxy, fluoro-methoxy or fluoro-acetoxy adducts was achieved when phenyl-substituted alkenes were treated with a MeCN solution of NFTh in the presence of water, methanol or acetic acid. The stereochemical course of fluoro-methoxylation reactions in the case of cyclic phenyl-substituted alkenes depends strongly on the structure of the alkene.
Stereochemistry and Some Kinetic Aspects of Fluorination of Phenyl-Substituted Alkenes with Selectfluor<sup>TM</sup>Reagent F-TEDA-BF<sub>4</sub>
作者:Stojan Stavber、Tjaša Sotler-Pecan、Marko Zupan
DOI:10.1246/bcsj.69.169
日期:1996.1
while equal amounts of both diastereoisomers were formed in the case of (E)-1-phenyl-1-propene and acenaphthylene. In the phenyl-substituted benzocyclene series the stereochemistry of fluoro-alkoxylation was found to be dependent on ring size and on the structure of the alcohol. The resulting vicinal fluoroalkoxy adducts were transformed by heating in aqueous HBr to 2-fluoro-1-phenylbenzocyclenes. Correlation