Copper-Catalyzed Trifluoromethylation of Aliphatic<i>N</i>-Arylhydrazones: A Concise Synthetic Entry to 2-Trifluoromethylindoles from Simple Aldehydes
作者:Alexis Prieto、Mélissa Landart、Olivier Baudoin、Nuno Monteiro、Didier Bouyssi
DOI:10.1002/adsc.201500237
日期:2015.9.14
trifluoromethylation of N,N‐disubstituted hydrazones using the Togni reagent is demonstrated to proceed efficiently for aliphatic aldehyde‐derived substrates. The success of the reactions relied on the choice of the N,N‐diphenylamino group as the terminal hydrazone amino group where N,N‐dialkylamino groups were preferred for (hetero)aromatic aldehyde‐derived substrates. In addition, the trifluoromethylated N‐arylhydrazones
已证明使用Togni试剂对N,N-二取代进行铜催化的C(sp 2)H三氟甲基化可有效地处理脂肪族醛衍生的底物。反应的成功取决于选择N,N-二苯基氨基作为terminal末端基团,其中N,N-二烷基氨基更适合用于(杂)芳醛衍生的底物。此外,三氟甲基化的N-芳基azo烷被证明是费希尔吲哚合成的理想底物,可通过简单的三步法从简单的醛类中获得2-三氟甲基吲哚衍生物。