Electrochemically induced free-radical tandem cyclisation of chlorodifluoromethylated ketones
作者:Philippe Hapiot、Maurice Médebielle
DOI:10.1016/s0022-1139(00)00372-9
日期:2001.2
substrates 7–10, yields new gem-difluoro heterocyclic compounds 11–16 after intramolecular cyclisation of a γ,γ-difluoroalkyl radical. Aromatic nucleophilic substitution of α,α-difluoroketones 12 and 13, in anhydrous dimethylsulfoxide, with several tetramethylammonium salts of imidazole as nucleophiles, proceeds under mild conditions to give the corresponding nitrogen–nitrogen exchanged products 17–23 in
一系列chlorodifluoromethylated酮的合成1 - 6被呈现和这些酮的还原裂解的循环伏安法进行了研究,在Ñ,Ñ二甲基甲酰胺(DMF),在惰性电极。间接电化学还原(通过电致阴离子自由基的手段)在乙腈(CH 3 CN)或在ñ,Ñ二甲基甲酰胺(DMF),萘衍生chlorodifluoroacetylated化合物1和2在烯烃底材的存在7 - 10,生成新的宝石-二氟杂环化合物11 - 16一γ,γ-二氟烷基自由基的分子内环化后。α,α-difluoroketones的芳香亲核取代12和13,在无水二甲亚砜,用咪唑作为亲核试剂,在温和条件下进行,得到相应的氮-氮的几个四甲基铵盐交换产品17 - 23在中度至良好的产率。