Development of Regio- and Face-selective [2 + 3] Cycloaddition Reactions of Readily Preparable Oxime-substituted Nitrile Oxides with Silicon-linked Allylic-alcohol Moieties for Intramolecular Reactions
作者:Nao Umemoto、Ayumi Imayoshi、Kazunori Tsubaki
DOI:10.1246/cl.220258
日期:2022.9.5
typically prepared in situ from nitroalkanes and converted to 2-isoxazoline heterocycles upon [2 + 3] cycloaddition with alkenes, providing synthetically useful intermediates such as β-hydroxy ketones and γ-amino alcohols. Herein, we prepared oxime-substituted nitrile oxides bound to allylic-alcohol derivatives through a silicon atom and demonstrated their intramolecular cycloaddition reactions. The desired
腈氧化物通常由硝基烷烃原位制备,并通过与烯烃的 [2 + 3] 环加成转化为 2-异恶唑啉杂环,从而提供合成有用的中间体,例如 β-羟基酮和 γ-氨基醇。在此,我们制备了通过硅原子与烯丙醇衍生物结合的肟取代的腈氧化物,并证明了它们的分子内环加成反应。所需的环加合物作为单一区域异构体以良好的收率获得。此外,使用α-取代的烯丙醇衍生物实现了面选择性环加成反应,提供了具有高非对映选择性的所需环加合物。