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
iodoarene-catalyzed fluorination reactions as a terminal oxidant is reported. This reaction is effective for the fluorination of simple alkenes, aromatic alkenes and 1,3-dicarbonyl compounds, giving 1,2-difluorinated alkanes, geminal difluorinated compounds, 2-fluorinated-1,3-dicarbonyl compounds in good to high yields, respectively. This is a useful fluorination reaction that not only improves the issues
报道了一种新的 N−F 试剂,N , N '-二氟-2,2'-联吡啶鎓双(四氟硼酸盐),作为末端氧化剂用于碘芳烃催化的氟化反应。该反应可有效氟化简单烯烃、芳香烯烃和1,3-二羰基化合物,分别以良好至高产率生成1,2-二氟化烷烃、偕二氟化化合物、2-氟化-1,3-二羰基化合物。这是一种有用的氟化反应,不仅改善了使用传统 mCPBA 作为末端氧化剂的氟化反应的问题,而且构建了更简单的催化循环。本发明的NF试剂可以作为2,2'-联吡啶回收。