Catalytic fluorination of 1,3-dicarbonyl compounds using iodoarene catalysts
作者:Tsugio Kitamura、Kazutaka Muta、Satoshi Kuriki
DOI:10.1016/j.tetlet.2013.08.129
日期:2013.11
Catalytic fluorination of 1,3-dicarbonylcompounds with aqueous hydrofluoric acid proceeded efficiently with the aid of iodoarene catalysts in the presence of m-CPBA as a terminal oxidant. o-Iodotoluene, o-iodoanisole, and o-ethyliodobenzene showed a high catalytic efficiency to give 2-fluoro-1,3-dicarbonyl compounds in good yields.
Abstract Direct fluorination of 1,3-dicarbonyl compounds including 1,3-diketones, 3-oxo esters, and 3-oxoamides was conducted using aqueoushydrofluoricacid with the aid of iodosylarenes, giving the corresponding 2-fluorinated products in good to high yields. Among the used iodosylarenes, o-iodosyltoluene was found to be the most effective, and the yield of 2-fluorinated products was improved. Direct
A Practical and Convenient Fluorination of 1,3-Dicarbonyl Compounds Using Aqueous HF in the Presence of Iodosylbenzene
作者:Tsugio Kitamura、Satoshi Kuriki、Mohammad Hasan Morshed、Yuji Hori
DOI:10.1021/ol200632d
日期:2011.5.6
and convenient fluorination of 1,3-dicarbonylcompounds was achieved by direct use of aqueous hydrofluoric acid and iodosylbenzene (PhIO). The reaction of ethyl benzoylacetate with the reagent system of aqueous HF and PhIO in CH2Cl2 gave ethyl 2-fluoro-2-benzolyacetate in 98% yield. Other 1,3-dicarbonylcompounds including β-keto esters and 1,3-diketones underwent the fluorination reaction to give
An object of the present invention is to provide a method for producing a fluorinated organic compound, whereby an iodosylbenzene derivative can be easily separated and recovered. The above object can be achieved by a method for producing a fluorinated organic compound, comprising step A of fluorinating an organic compound (1) by reaction with a fluorine source (3) in the presence of an iodine-containing polymer (2ap) having one or more hypervalent iodine aromatic ring moieties, in the presence of a combination of an oxidant (2bo) and an iodine-containing polymer (2bp) having one or more iodine aromatic ring moieties, or in the presence of an iodine-containing polymer (2cp) having one or more IF
2
-substituted aromatic ring moieties; wherein the fluorine source (3) is a fluorine source (3a) represented by formula: MF
n
, wherein M is H, a metal of Group 1 of the periodic table, or a metal of Group 2 of the periodic table; and n is 1 or 2, the polymer (2cp) having one or more IF
2
-substituted aromatic ring moieties, or a combination thereof.
Synthesis of Highly Functionalized Biaryls by Condensation of 2-Fluoro-1,3-bis(silyloxy) 1,3-Dienes with 3-Cyanochromones and Subsequent Domino “Retro-Michael/Aldol/Fragmentation”
The Me3SiOTf-mediated condensation of 1-ethoxy-2-fluoro-1,3-bis(trimethylsilyloxy) 1,3-dienes with 3-cyanochromones afforded 3-cyano-2-(4-ethoxy-3-fluoro-2,4-dioxobutyl)-chroman-4-ones. Their reaction with triethylamine afforded fluorinated azaxanthones or biaryls. The product distribution depends on the structure of the diene. The formation of the biaryls can be explained by an unprecedented domino "retro-Michael/aldol/fragmentation" reaction.