A new synthetic method for medium and large-sized carbocycles has been developed. An acyclic compound having an olefin moiety and a 3-(methylthio)allyl acetate moiety at each of the terminal positions was designed as a cyclization precursor. The corresponding allyl cation intermediate, which was generated by treatment with EtAlCl2, underwent cyclization via an intramolecular addition reaction. The ring size of the product, which depends on the reaction site of the allyl cation, can be controlled by changing the nucleophilicity of the terminal olefin moiety.
一种新的合成方法已用于中、大型碳环。一种无环化合物在末端位置分别具有烯烃基团和3-(甲基
硫代)
烯丙基乙酸酯基团,被设计为环化前体。相应的烯丙基阳离子中间体通过EtAlCl2处理生成,并通过分子内加成反应进行环化。产物的环数取决于烯丙基阳离子的反应位点,可通过改变末端烯烃基团的亲核性来控制。