Metal-Free Tandem Oxidative Cyclization for the Synthesis of 1,2-Dihydropyridazines and Pyrazoles
作者:Dongping Cheng、Yinqiang Shen、Ziliang Wu、Xiaoliang Xu、Jizhong Yan
DOI:10.1021/acs.joc.1c00020
日期:2021.7.2
disclosed to generate appealing β,γ-unsaturated hydrazones, which further undergo 5-exo-trig or 6-endo-trig cascade cyclization to give the respective 1,2-dihydropyridazines or pyrazoles selectively under metal-free conditions. The mechanisms of the coupling and subsequent cyclization are proposed.
在 2,3-二氯-5,6-二氰基-1,4-苯醌 (DDQ) 介导下,腙和 1,3-二芳基丙烯的新型氧化偶联已被公开,可生成有吸引力的 β,γ-不饱和腙,这进一步在无金属条件下进行5- exo -trig或6- end -trig级联环化,选择性地生成各自的1,2-二氢哒嗪或吡唑。提出了偶联和随后环化的机制。