Visible-Light-Enabled Lanthanum-Mediated Intramolecular Epoxy-Ring Opening/Dehydrogenative Lactonization
作者:Lina Cai、Qihong Lai、Lele Zhang、Guotao Xue、Yirui Zhang、Na He、Mingqiang Huang、Shirong Hu、Shunyou Cai
DOI:10.1021/acs.orglett.3c02589
日期:2023.10.6
Catalytic C(sp3)–H functionalization has afforded great opportunities to prepare organic substances, facilitating the derivatization of complex drugs and natural molecules. This letter describes an efficient and practical protocol for lanthanum-catalyzed continuous epoxy-ring opening and oxidative dehydrogenative lactonization under visible-light irradiation. Notably, the lanthanum catalyst also acts
催化C(sp 3 )–H官能化为制备有机物质提供了巨大的机会,促进了复杂药物和天然分子的衍生化。这封信描述了在可见光照射下镧催化连续环氧开环和氧化脱氢内酯化的有效且实用的方案。值得注意的是,镧催化剂在该反应中充当路易斯酸的同时也充当光催化剂;因此,不需要额外的光催化剂。我们可以在室温下的气球氧气氛下方便地制备一系列具有含氧螺环结构单元的不同异色满酮。机理研究和控制实验表明,原位产生的溴化镧在反应中至关重要。