[反应:参见正文]使用1-氯甲基-4-氟-1,4-二氮杂双环[2.2.2]辛烷双(四氟硼酸酯)(Selectfluor F -TEDA-BF4)。因此,将2-萘酚和2-甲氧基萘转化为1,1-二氟-2(1H)萘酮,将雌酮转化为10β-氟-1,4-雌二醇-3,17-二酮,将苯基取代的烯烃转化为邻位氟代醇,和各种酮,1,3-二酮或β-酮酸酯,以形成相应的α-氟或α,α-二氟酮。
[EN] ASYMMETRIC ELECTROPHILIC FLUORINATION USING AN ANIONIC CHIRAL PHASE-TRANSFER CATALYST<br/>[FR] FLUORATION ÉLECTROPHILE ASYMÉTRIQUE UTILISANT UN CATALYSEUR DE TRANSFERT DE PHASE CHIRAL ANIONIQUE
申请人:UNIV CALIFORNIA
公开号:WO2013096971A1
公开(公告)日:2013-06-27
The discovery of distinct modes of asymmetric catalysis has the potential to rapidly advance chemists' ability to build enantioenriched molecules. As an example, the use of chiral cation salts as phase-transfer catalysts for anionic reagents has enabled a vast set of enantioselective transformations. A largely overlooked analogous mechanism wherein a chiral anionic catalyst brings a cationic species into solution is itself a powerful method. The concept is broadly applicable to a number of different reaction pathways, including to the enantioselective fluorocyclization of olefins, and dearomatization of aromatic systems with a cationic electrophile-transferring (e.g., fluorinating) agent and a chiral phosphate catalyst. The reactions proceed in high yield and stereoselectivity. The compounds and methods of the invention are of particular value, especially considering the scarcity of alternative approaches.
[reaction: see text] Selective and effective fluorination of various types of organiccompounds performed in water as the reaction medium using 1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (Selectfluor F-TEDA-BF4) is reported. 2-Naphthole and 2-methoxynaphthalene were thus transformed to 1,1-difluoro-2(1H)naphthalenone, estrone to 10beta-fluoro-1,4-estradien-3,17-dione
[反应:参见正文]使用1-氯甲基-4-氟-1,4-二氮杂双环[2.2.2]辛烷双(四氟硼酸酯)(Selectfluor F -TEDA-BF4)。因此,将2-萘酚和2-甲氧基萘转化为1,1-二氟-2(1H)萘酮,将雌酮转化为10β-氟-1,4-雌二醇-3,17-二酮,将苯基取代的烯烃转化为邻位氟代醇,和各种酮,1,3-二酮或β-酮酸酯,以形成相应的α-氟或α,α-二氟酮。
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.
Efficient oxidative ipso-fluorination of para-substituted phenols using pyridinium polyhydrogen fluoride in combination with hypervalent iodine(III) reagents
4-fluorocyclohexa-2,5-dienones in a good yield. (R,S)-1,1′-Bi-5,6,7,8-tetrahydro-2-naphthol (and its monoacetate) yields atropoisomericfluorocyclohexadienones. The 4-substituted carbamate open-chain phenols were readily converted to fluorohydroindolenone and fluorohydroquinolenone derivatives by intramolecular conjugate addition.
Nucleophilic para-fluorination of 4-alkylphenols by hypervalent iodine reagent and pyridinium polyhydrogen fluoride (PPHF) a novel route to 4-fluorocyclohexa-2,5-dienones