Use of a Traceless Activating and Directing Group for the Construction of Trifluoromethylpyrazoles: One-Pot Transformation of Nitroolefins and Trifluorodiazoethane
作者:Zhen Chen、Yan Zheng、Jun-An Ma
DOI:10.1002/anie.201700955
日期:2017.4.10
We disclose an efficient one‐pot transformation of trifluorodiazoethane and higher perfluorinated homologues with various nitroolefins. This method takes advantage of the nitro group as a traceless activating and directing group (TADG) that is released in the aromatization step to produce 4‐substituted 3‐perfluoroalkyl pyrazoles with complete regioselectivity. The potential of this method is further
我们公开了三氟重氮乙烷的高效单锅转化以及与各种硝基烯烃的更高全氟化同系物。该方法利用了硝基作为无痕的活化和导向基团(TADG)的优势,该基团在芳构化步骤中释放出来,以产生具有完全区域选择性的4-取代的3-全氟烷基吡唑。该方法的潜力通过戊硫吡喃的合成得到进一步证明。