Synthesis of 3<i>H</i>-1,2,4-Triazol-3-ones via NiCl<sub>2</sub>-Promoted Cascade Annulation of Hydrazonoyl Chlorides and Sodium Cyanate
作者:Shiying Du、Zuguang Yang、Jianhua Tang、Zhengkai Chen、Xiao-Feng Wu
DOI:10.1021/acs.orglett.1c00568
日期:2021.3.19
A nickel-promoted cascade annulation reaction for the facile synthesis of 3H-1,2,4-triazol-3-ones from readily available hydrazonoyl chlorides and sodium cyanate has been developed. The transformation occurs through a cascade nickel-promoted intermolecular nucleophilic addition–elimination process, intramolecular nucleophilic addition, and a hydrogen-transfer sequence. The method has been successfully
已经开发了镍促进的级联环化反应,用于从容易获得的酰肼基氯和氰酸钠容易地合成3 H -1,2,4-三唑-3-酮。通过级联镍促进的分子间亲核加成-消除过程,分子内亲核加成和氢转移序列进行转化。该方法已成功应用于血管紧张素II拮抗剂的核心骨架的构建。