Catalytic Asymmetric Synthesis of Stable Oxetenes via Lewis Acid-Promoted [2 + 2] Cycloaddition
作者:Kohsuke Aikawa、Yu̅ta Hioki、Natsumi Shimizu、Koichi Mikami
DOI:10.1021/ja2085299
日期:2011.12.21
A highly enantioselective and atom-economical [2 + 2] cycloaddition of various alkynes with trifluoropyruvate using a dicationic (S)-BINAP-Pd catalyst has been established. This is the first enantioselective synthesis of stable oxetene derivatives, whose structure has been clarified by X-ray analysis. This catalytic process offers a practical synthetic method for oxetene derivatives (catalyst loading:
已经建立了使用双阳离子 (S)-BINAP-Pd 催化剂对各种炔烃与三氟丙酮酸进行高度对映选择性和原子经济的 [2 + 2] 环加成反应。这是第一个对映选择性合成稳定的氧杂环丁烯衍生物,其结构已通过 X 射线分析阐明。这种催化过程为氧杂环丁烯衍生物(催化剂负载量:高达 0.1 mol%)提供了一种实用的合成方法,可作为药物和农用化学品的新型手性构件,也可以转化为各种对映体富集的 CF(3)-具有高立体选择性的取代化合物。