作者:Xiong, Shu-Shu、Jian, Cui、Mo, Yan-Qing、Hu, Wei、He, Yong-Ke、Ren, Bao-Yi、Yang, Yu-Ming、Li, Shaoyu
DOI:10.1021/acs.joc.4c00929
日期:——
contrast to the well-developed hydrogen functionalization. Current exploration on [4 + 2] cyclization of vinylpyridines mainly relies on extremely high temperatures and the LUMO activation of vinylpyridines using boron trifluoride as a strong Lewis acid. Herein, we established a phosphoric acid-catalyzed [4 + 2] cyclization reaction of 3-vinyl-1H-indoles and 2-vinylpyridines by means of the LUMO/HOMO
与成熟的氢官能化相比,基于环化策略的乙烯基吡啶双官能化仍然罕见且不发达。目前对乙烯基吡啶[4+2]环化的探索主要依赖于极高的温度和使用三氟化硼作为强路易斯酸对乙烯基吡啶的LUMO活化。在此,我们通过LUMO/HOMO双功能激活模型建立了磷酸催化的3-乙烯基-1H-吲哚和2-乙烯基吡啶的[4+2]环化反应。该方案具有反应条件温和、官能团耐受性高、底物兼容性广、非对映选择性高等特点,能够高效构建各种功能化吡啶取代四氢咔唑,在药物发现方面具有突出的潜力。