Iodine-Catalyzed Regioselective Oxidative Cyclization of Aldehyde Hydrazones with Electron-Deficient Olefins for the Synthesis of Mefenpyr-Diethyl
作者:Jia-Nan Zhu、Wen-Kang Wang、Jian Zheng、Hao-Peng Lin、Yun-Xia Deng、Sheng-Yin Zhao
DOI:10.1021/acs.joc.9b01499
日期:2019.9.6
A regioselective synthesis of polysubstituted dihydropyrazoles and pyrazoles through an iodine-catalyzed oxidative cyclization strategy of aldehyde hydrazones with electron-deficient olefins is described. The protocol adopts very mild reaction conditions and provides desirable yields. The reaction is supposed to proceed via a cascade C–H functionalization, C–N bond formation, and oxidation sequential
描述了通过碘与缺电子的烯烃的碘azo的氧化环化策略的区域选择性合成多取代的二氢吡唑和吡唑。该方案采用非常温和的反应条件,并提供了令人满意的收率。该反应被认为是通过级联的C–H官能化,C–N键的形成和氧化顺序过程进行的。催化系统的整体简便性和区域选择性使该方法成为构建用于合成甲芬比二乙基的CC键的有价值且分步经济的工具。