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‐closing metathesis 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。