Kinetic Resolution and Dynamic Kinetic Resolution of Chromene by Rhodium‐Catalyzed Asymmetric Hydroarylation
作者:Qingjing Yang、Yanbo Wang、Shihui Luo、Jun (Joelle) Wang
DOI:10.1002/anie.201900721
日期:2019.4.8
A highly efficient kineticresolution and dynamickineticresolution of chromene is reported for the first time and they procced by a rhodium‐catalyzed asymmetric hydroarylation pathway. This new approach offers versatile access to various chiral 2,3‐diaryl‐chromanes containing vicinal stereogenic centers, as well as the recovered chiral flavenes, in high yields with excellent ee values (s factor up
Iridium-Catalyzed Asymmetric Allylic Etherification and Ring-Closing Metathesis Reaction for Enantioselective Synthesis of Chromene and 2,5-Dihydrobenzo[b]oxepine Derivatives
作者:Hu He、Ke-Yin Ye、Qing-Feng Wu、Li-Xin Dai、Shu-Li You
DOI:10.1002/adsc.201100809
日期:2012.4.16
Iridium‐catalyzed asymmetric etherifications of allylic carbonates with 2‐vinylphenols and 2‐allylphenols were realized. With a catalyst generated from 2 mol% of [Ir(cod)Cl]2 (cod=cycloocta‐1,5‐diene) and 4 mol% of the phosphoramidite ligand L2, the etherification products were obtained in excellent ees and then subjected to the ring‐closingmetathesis reaction providing an efficient synthesis of enantioenriched
实现了铱催化的烯丙基碳酸酯与2-乙烯基苯酚和2-烯丙基苯酚的不对称醚化。使用由2 mol%的[Ir(cod)Cl] 2(cod = cycloocta-1,5-二烯)和4 mol%的亚磷酰胺配体L2生成的催化剂,可以在优异的ee s中获得醚化产物,然后进行醚化处理。闭环易位反应,提供了对映体富集的2 H-色烯和2,5-二氢苯并[ b ]氧杂环丁烷衍生物的有效合成。