Weakly coordinating group directed rhodium-catalyzed unconventional site-selective C–H olefination of indolizines at the 8-position
作者:Xue Feng、Jiaxin Tian、Ying Sun、Huayou Hu、Mingzhu Lu、Yuhe Kan、Danjun Fang、Chao Wang
DOI:10.1016/j.cclet.2020.02.039
日期:2021.1
rhodium-catalyzed directing group promoted selective C–H olefination reaction of indolizines at the 8-position is reported. Di-olefination at 2,8-positions also achieved with silver hexafluoroantimonate as an additive under similar reaction conditions. Weakly coordinating groups, such as ketone, aldehyde, amide and ester, were used as directing groups. The ester group can be removed under acid conditions
摘要报道了铑催化的导向基团促进了吲哚嗪在8位的选择性C–H烯化反应。在相似的反应条件下,用六氟锑酸银作为添加剂也可实现2,8位的二烯化。弱配位基团,例如酮,醛,酰胺和酯,被用作导向基团。酯基可在酸性条件下除去,因此用作无痕的导向基团。