prepared allene-alkynylbenzenes to give pyrrolidines and cyclopentanes derivatives was developed. This reaction is initiated by the generation of allylic cation from allene, followed by alkyne’s reaction with the allylic cation, to give a vinyl cation, which is finally intercepted by the triflate (TfO) anion. This cycloisomerization can be further tuned to become an acid-mediated intramolecular formal
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金属,TfOH(1.1当量)介导的易于制备的烯丙基-炔基苯的正式环异构化反应,得到
吡咯烷和
环戊烷衍
生物。该反应通过从
丙二烯生成烯丙基阳离子开始,然后由
炔烃与烯丙基阳离子反应,得到
乙烯基阳离子,该
乙烯基阳离子最终被
三氟甲磺酸根(TfO)阴离子拦截。通过使用10当量的TfOH(可以将过量的酸用于促进酸介导的环异构化产物的Friedel-Crafts反应),可以将该环异构化进一步调整为酸介导的分子内形式的[4 + 3]环加成反应。通过使用HBF 4或Me 3 OBF 4作为
氟源,本系统还可以应用于合成的掺入F的产物。