Mild and selective α-fluorination of carbonyl compounds (ketones, 1,3-diketones, β-ketoesters, α-nitroketones, and β-ketonitriles) with Selectfluor (F-TEDA-BF4) in imidazolium ILs [BMIM/PF6 or BMIM/NTf2] with Brønsted-acidic IL [PMIM(SO3H)/OTf] as promoter
摘要:
Structurally diverse ketones, 1,3-diketones, and beta-ketoesters, were selectively monofluorinated with Selectfluor (F-TEDA-BF4) (1 equiv) in [BMIM][PF6] as solvent and [PMIM(SO3H)][OTf] as promoter under mild conditions. In selected cases, the monofluorinated products were transformed to the gem-difluoro derivatives by employing an additional equivalent of Selectfluor, and gem-difluoro-derivatives were synthesized directly from the substrates by employing 2 equiv of Selectfluor. The method was extended to monofluorination of representative alpha-nitroketones and beta-ketonitriles using [BMIM][NTf2] without the need for promoters. The described method offers the added advantage of recycling and reuse of the IL solvent.
Convenient fluorination of nitro and nitrile compounds with Selectfluor
作者:Weimin Peng、Jean’ne M. Shreeve
DOI:10.1016/j.tetlet.2005.05.056
日期:2005.7
A variety of nitro and nitrile compounds were fluorinated in good yields by Selectfluor under mild conditions. For these transformations to be successful, it is crucial to select proper amounts of an appropriate base as a function of the properties of the substrate and also to use Selectfluor only as required. (c) 2005 Elsevier Ltd. All rights reserved.
US4880814A
申请人:——
公开号:US4880814A
公开(公告)日:1989-11-14
Mild and selective α-fluorination of carbonyl compounds (ketones, 1,3-diketones, β-ketoesters, α-nitroketones, and β-ketonitriles) with Selectfluor (F-TEDA-BF4) in imidazolium ILs [BMIM/PF6 or BMIM/NTf2] with Brønsted-acidic IL [PMIM(SO3H)/OTf] as promoter
作者:A. Srinivas Reddy、Kenneth K. Laali
DOI:10.1016/j.tetlet.2015.07.084
日期:2015.10
Structurally diverse ketones, 1,3-diketones, and beta-ketoesters, were selectively monofluorinated with Selectfluor (F-TEDA-BF4) (1 equiv) in [BMIM][PF6] as solvent and [PMIM(SO3H)][OTf] as promoter under mild conditions. In selected cases, the monofluorinated products were transformed to the gem-difluoro derivatives by employing an additional equivalent of Selectfluor, and gem-difluoro-derivatives were synthesized directly from the substrates by employing 2 equiv of Selectfluor. The method was extended to monofluorination of representative alpha-nitroketones and beta-ketonitriles using [BMIM][NTf2] without the need for promoters. The described method offers the added advantage of recycling and reuse of the IL solvent.