Abnormal and Direct para-Trifluoroacetylation of Branched Alkyl Phenyl Ketones by Magnesium-Promoted Reductive Aromatic Substitution
作者:Hirofumi Maekawa、Taro Ozaki、Dayana Zulkeflee、Taro Murakami、Shin Kihara、Ikuzo Nishiguchi
DOI:10.1055/s-0031-1290325
日期:2012.2
Magnesium-promoted reduction of branched alkyl phenyl ketones in the presence of ethyl trifluoroacetate and chlorotrimethylsilane in N,N-dimethylformamide (DMF), followed by air oxidation, and the subsequent treatment of tetrabutylammonium fluoride brought about selective and efficient formation of the corresponding aromatic para-substituted diketones possessing a trifluoroacetyl group in good yields
在N,N-二甲基甲酰胺(DMF)中,在三氟乙酸乙酯和氯代三甲基硅烷存在下,镁促进的支链烷基苯基酮的还原,然后进行空气氧化,随后对四丁基氟化铵的处理导致相应芳族对位的选择性和有效形成通过向芳族酮的对位异常加成,可以以良好的产率高收率地具有三氟乙酰基的三取代的二酮。 三氟乙酰化-交叉偶联-电子转移-镁-还原