Diastereoselective Synthesis of Pyrazolo[1,2‐<i>a</i>][1,2,4]triazine Derivatives via Cross‐1,3‐dipolar Cyclizations of Azaoxyallyl Cations with <i>N,N′</i>‐Cyclic Azomethine Imines
作者:Gang Wang、Jiang Wu、Yi Li、Zicheng Huang、Jing Zou、Zhao‐Lin He
DOI:10.1002/ejoc.202300450
日期:2023.9.6
Pyrazolo[1,2-a][1,2,4]triazine derivatives were synthesized in good yields and excellent diastereoselectivities.via cross-1,3-dipolar cyclizations of α-halohydroxamates (in situ generated azaoxyallyl cations) with N,N′-cyclic azomethine imines under mild metal-free conditions.
通过α-卤代异羟肟酸酯(原位生成的氮杂氧基烯丙基阳离子)与N,N的交叉 1,3-偶极环化,以良好的收率和优异的非对映选择性合成了吡唑并[1,2-a][1,2,4]三嗪衍生物'-环状偶氮甲碱亚胺在温和的无金属条件下。