使用Fenton试剂在二甲亚砜中研究了BrCF 2 CO 2 Et对芳族化合物的直接乙氧基羰基二氟甲基化反应。在室温下,通过二茂铁和H 2 O 2的组合,催化获得具有乙氧基羰基二氟甲基的各种五元杂芳族化合物,苯衍生物和尿嘧啶。乙氧基羰基二氟甲基化发生在芳香族化合物亲电取代趋势预测的位置。当使用对位取代的苯胺衍生物作为底物时,通过在乙氧基羰基二氟甲基化反应中一锅合成3,3-二氟-2,3-二氢吲哚-2-酮衍生物。氨基的邻位和氨基与相邻的乙氧基羰基二氟甲基的连续分子内酰胺化。
New Antifungal 1,2,4-Triazoles with Difluoro(heteroaryl)methyl Moiety.
作者:Hiromichi ETO、Yasushi KANEKO、Takao SAKAMOTO
DOI:10.1248/cpb.48.982
日期:——
New 1, 2, 4-triazoles (1) having a difluoro(heteroaryl)methyl moiety were designed and synthesized via 1-aryl-2, 2-difluoro-2-(heteroaryl)ethanones (2), which were prepared by two routes starting from the reaction of ethyl 2, 2-difluoro(heteroaryl)acetate with phenyllithiums (Route A) and from the reaction of chlorodifluoro(heteroaryl)methane with benzaldehydes (Route B). The compounds 1 except for 1g show antifungal activities against yeasts and filamentous fungi in vitro, especially (+)-1f have equal or superior activities compared to those of itraconazole.
Direct ethoxycarbonyldifluoromethylation of aromatic compounds using Fenton reagent
作者:Yuhki Ohtsuka、Tetsu Yamakawa
DOI:10.1016/j.tet.2011.01.049
日期:2011.3
Direct ethoxycarbonyldifluoromethylation of aromaticcompounds by BrCF2CO2Et was investigated using Fenton reagent in dimethylsulfoxide. Various five-membered hetero-aromatic compounds, benzene derivatives and uracil having ethoxycarbonyldifluoromethyl group were obtained catalytically with the combination of ferrocene and H2O2 at room temperature. The ethoxycarbonyldifluoromethylation occurred at
使用Fenton试剂在二甲亚砜中研究了BrCF 2 CO 2 Et对芳族化合物的直接乙氧基羰基二氟甲基化反应。在室温下,通过二茂铁和H 2 O 2的组合,催化获得具有乙氧基羰基二氟甲基的各种五元杂芳族化合物,苯衍生物和尿嘧啶。乙氧基羰基二氟甲基化发生在芳香族化合物亲电取代趋势预测的位置。当使用对位取代的苯胺衍生物作为底物时,通过在乙氧基羰基二氟甲基化反应中一锅合成3,3-二氟-2,3-二氢吲哚-2-酮衍生物。氨基的邻位和氨基与相邻的乙氧基羰基二氟甲基的连续分子内酰胺化。
Direct Introduction of Ethoxycarbonyldifluoromethyl-Group to Heteroarenes with Ethyl Bromodifluoroacetate via Visible-Light Photocatalysis
作者:Qingyu Lin、Lingling Chu、Feng-Ling Qing
DOI:10.1002/cjoc.201300411
日期:2013.7
A mild and versatile approach for the directintroduction of ethoxycarbonyldifluoromethyl‐group to heteroarenesvia visible‐light photocatalysis has been developed. The new photoredox protocol has enabled the difluoromethylenation of heteroarenes containing a wide range of common functional groups under mild conditions.
The first AgI-mediated C–H ethoxycarbonyl difluoromethylation with TMSCF2COOEt (TMS = trimethylsilyl) has been developed. The radical difluoromethylation proceeds smoothly to give the difluoromethylated arenes in moderate to high yields with Friedel–Crafts-type regioselectivity. Mechanistic studies indicate that the innate C–H difluoromethylation proceeds through an electrophilic radical-type pathway
Chiralα,α-difluoromethyl carbinols are recurring structural motifs in many therapeutic agents. Despite the indubitable interest in the catalytic asymmetric synthesis of such compounds, this research field still remains largely underexplored. Herein, an efficient approach to a range of chiral homopropargylic α,α-difluoromethyl carbinols has been developed, through a Cu-catalyzed enantioselective propargylation