Organocatalytic Asymmetric Synthesis of Chiral Dioxazinanes and Dioxazepanes with <i>in Situ</i> Generated Nitrones via a Tandem Reaction Pathway Using a Cooperative Cation Binding Catalyst
作者:Yidong Liu、Jun Ao、Sushovan Paladhi、Choong Eui Song、Hailong Yan
DOI:10.1021/jacs.6b10660
日期:2016.12.21
pharmaceuticals and biological processes. Cycloaddition reactions are most suitable synthetic tools to efficiently construct chemically diverse sets of heterocycles with great structural complexity owing to the simultaneous or sequential formation of two or more bonds, often with a high degree of selectivity. Herein, we report an unprecedented formal cycloaddition of N-Boc-N-hydroxy amido sulfones as the nitrone
杂环骨架在药物和生物过程中起着重要作用。由于同时或顺序形成两个或多个键,环加成反应是最合适的合成工具,可以有效地构建具有高度结构复杂性的化学多样化的杂环组,通常具有高度的选择性。在此,我们报告了在宋的手性低聚乙二醇作为阳离子结合催化剂和 KF 作为硝酮前体与末端羟基 α,β-不饱和羰基的 N-Boc-N-羟基酰氨基砜的前所未有的正式环加成反应。碱以提供范围广泛的高度对映体和非对映体富集的六元二恶嗪烷和七元二恶氮杂环。在这个过程中,硝酮以及末端羟基α,β-不饱和羰基充当“