Catalytic asymmetric conjugate addition of coumarins to unsaturated ketones catalyzed by a chiral-at-metal Rh(<scp>iii</scp>) complex
作者:Xiangjie Chen、Yujie Zhao、Cheng Huang、Zhifei Zhao、Weiwei Zhao、Shi-Wu Li
DOI:10.1039/d3cc04726a
日期:——
The first catalytic asymmetric vinylogous Michael addition of coumarins to unsaturated ketones catalyzed by chiral rhodium catalysts has been established. This strategy allowed the synthesis of a variety of highly enantioenriched compounds containing coumarin skeletons in 41–99% yields and 84–99% ee. The developed reaction enriches the chemistry of catalytic asymmetric vinylogous Michael additions
首次在手性铑催化剂催化下,香豆素与不饱和酮发生不对称插烯迈克尔加成反应。该策略允许以 41-99% 的产率和 84-99% ee 合成各种高度对映体富集的含有香豆素骨架的化合物。所开发的反应丰富了3-氰基-4-甲基香豆素催化不对称插烯迈克尔加成的化学性质。此外,该方案在反应对映选择性方面表现出明显的优势。当手性铑催化剂减少至0.06 mol%时,仍能实现革兰氏级反应,得到99% ee的目标产物。