18
F‐Labeling of Aryl‐SCF
3
, ‐OCF
3
and ‐OCHF
2
with [
18
F]Fluoride
摘要:
AbstractWe report that halogenophilic silver(I) triflate permits halogen exchange (halex) nucleophilic 18F‐fluorination of aryl‐OCHFCl, ‐OCF2Br and ‐SCF2Br precursors under mild conditions. This AgI‐mediated process allows for the first time access to a range of 18F‐labeled aryl‐OCHF2, ‐OCF3 and ‐SCF3 derivatives, inclusive of [18F]riluzole. The 18F‐labeling of these medicinally important motifs expands the radiochemical space available for PET applications.
Difluoroiodomethylsulfanylbenzene (3a) and 1-chloro-4-difluoroiodomethylsulfanylbenzene (3b) are novel and efficient difluoromethylating reagents via the reaction with unsaturated compounds, such as alkenes, ethynylbenzene, pent-4-en-1-ols, and pent-4-enoic acids initiated by Na2S2O4, to afford the corresponding adducts, tetrahydrofuran derivatives, and γ-butyrolactones containing difluoromethylene
二氟碘甲基硫烷基苯(3a)和1-氯-4-二氟碘甲基硫烷基苯(3b)是通过与不饱和化合物(如烯烃,乙炔基苯,戊-4-烯-1-醇和戊-4-烯醇)反应而形成的新型高效二氟甲基化试剂。由Na 2 S 2 O 4引发的酸,以中等至良好的产率得到相应的加合物,四氢呋喃衍生物和含二氟亚甲基的γ-丁内酯。
AIBN-initiated radical addition of gem-difluorinated alkyl iodides to alkynes and the Pd-catalyzed Sonogashira coupling reaction of E-phenyl difluoromethylene vinylic iodides with terminal alkynes
The addition of gem-difluorinated alkyl iodides to alkynes initiated by AIBN neatly gave the corresponding difluoromethylene vinyliodides among which the stereoselectivity of aromatic acetylenes was high. The further coupling reaction of E-phenyl difluoromethylene vinyliodides with terminalalkynes in the presence of catalytic palladium afforded the substituted difluorinated enynes.
a visible-light-induced iridium-promoted direct bifunctionalization of 3-butenoicacid with bromodifluoromethyl heteroarylsulfones. This methodology enables the concurrent introduction of difluoromethyl heteroarylsulfone and bromine groups into 3-butenoicacid under mild reaction conditions. Various α-substituted 3-butenoicacids and bromodifluoromethyl heteroarylsulfones were found to be compatible
A Convergent Route to Geminal Difluorosulfides and to Functionalized Difluorothiochromans, a New Family of Organofluorine Compounds
作者:Pierre Salomon、Samir Z. Zard
DOI:10.1021/ol5002939
日期:2014.3.7
The synthesis of the novel O-ethyl-S-(4-chlorophenylthio)difluoromethyl xanthate and its radical addition to various terminal alkenes are described. The geminal difluorosulfide adducts undergo closure onto the aromatic ring by further treatment with peroxide to furnish difluorothiochromans, a new family of organofluorine compounds.
Electrophilic Difluoro(phenylthio)methylation: Generation, Stability, and Reactivity of α-Fluorocarbocations
作者:Nolan M. Betterley、Panida Surawatanawong、Samran Prabpai、Palangpon Kongsaeree、Chutima Kuhakarn、Manat Pohmakotr、Vichai Reutrakul
DOI:10.1021/ol402631t
日期:2013.11.15
Electrophilic difluoro(phenylthio)methylation of allylsilanes has been achieved using bromodifluoro(phenylthio)methane (PhSCF2Br) and silver hexafluoroantimonate (AgSbF6). The structural assignment and observation of alpha-fluorocarbocation were substantiated by NMR and theoretical calculations. Detailed mechanistic and electronic studies have provided a fundamental understanding of the reactivity and stability of the difluoro(phenylthio)methylium cation (PhSCF2+).