Substrate-Switched Chemodivergent Pyrazole and Pyrazoline Synthesis: [3 + 2] Cycloaddition/Ring-Opening Rearrangement Reaction of Azadienes with Nitrile Imines
作者:Liang Tu、Limei Gao、Qiang Wang、Zhixing Cao、Rong Huang、Yongsheng Zheng、Jikai Liu
DOI:10.1021/acs.joc.1c02998
日期:2022.3.4
new reaction model of benzofuran-derived azadienes (BDAs), an unprecedented synthesis of biologically important pyrazoles has been achieved through a tandem [3 + 2] cycloaddition/ring-opening rearrangement reaction of BDAs with nitrile imines. The nature and type of substrates are found to act as a chemical switch to trigger two distinct reaction pathways. A minor modification to the substrates allows
凭借苯并呋喃衍生的氮杂二烯 (BDA) 的全新反应模型,通过 BDA 与腈亚胺的串联 [3 + 2] 环加成/开环重排反应,实现了前所未有的生物重要吡唑合成。发现底物的性质和类型可作为化学开关来触发两种不同的反应途径。对底物稍作修改即可获得螺吡唑啉。