Synthesis of 3,5-Disubstituted Isoxazoles through a 1,3-Dipolar Cycloaddition Reaction between Alkynes and Nitrile Oxides Generated from <i>O</i>
-Silylated Hydroxamic Acids
作者:Laure-Elie Carloni、Stefan Mohnani、Davide Bonifazi
DOI:10.1002/ejoc.201901045
日期:2019.11.30
by 1,3‐dipolar cycloaddition between alkynyl dipolarophiles and nitrile oxide dipoles generated in‐situ from O‐silylated hydroxamic acids in the presence of trifluoromethanesulfonic anhydride and NEt3. Thanks to the mild, metal‐free and oxidant‐free conditions that this strategy offers, the reaction was successfully applied to a wide variety of alkynyl dipolarophiles, demonstrating the tolerance of this
在本文中,我们报告了在三氟甲磺酸酐和 NEt3 存在下,由 O-硅烷化异羟肟酸原位生成的炔基偶极亲和物和腈氧化物偶极之间的 1,3-偶极环加成反应,区域选择性合成 3,5-二取代异恶唑。由于该策略提供了温和、无金属和无氧化剂的条件,该反应成功地应用于各种炔基偶极亲和体,证明了这种方法对不同官能团的耐受性。特别是,我们已经证明该方法与生物分子如肽和肽核酸 (PNA) 兼容。该方案构成了导致异恶唑区域选择性形成的无金属 1,3-偶极环加成的另一个例子。