Iodine-Mediated Oxidative Annulation of β,γ-Unsaturated Hydrazones in Dimethyl Sulfoxide: A Strategy to Build 1,6-Dihydropyridazines and Pyrroles
作者:Qianrui Liu、Jiaming Jiang、Xuanzeng Ye、Jiawen Sun、Yao Wu、Yinlin Shao、Chao Deng、Fangjun Zhang
DOI:10.1021/acs.joc.3c00669
日期:2023.8.4
Simple, commercially available iodine was successfully employed as a highly efficient and chemoselective catalyst for the oxidative annulation of β,γ-unsaturated hydrazones to produce 1,6-dihydropyridazines under mild conditions for the first time. Interestingly, when active β,γ-unsaturated hydrazone compounds containing electron-donating groups, such as furyl, thienyl, and cycloalkyl, were used, pyrroles
简单的市售碘首次被成功地用作高效化学选择性催化剂,用于 β,γ-不饱和腙的氧化成环,从而在温和条件下生产 1,6-二氢哒嗪。有趣的是,当使用含有给电子基团(例如呋喃基、噻吩基和环烷基)的活性β,γ-不饱和腙化合物时,得到了吡咯。哒嗪的克级制备实验和进一步衍生化证明了我们的合成方法的潜在适用性。实验研究和密度泛函理论计算揭示了决定不同产物形成的化学选择性的起源。