<i>N</i>-Heterocyclic Carbene-Catalyzed Enantioselective Annulation of Indolin-3-ones with Bromoenals
作者:Qijian Ni、Xiaoxiao Song、Gerhard Raabe、Dieter Enders
DOI:10.1002/asia.201402052
日期:2014.6
N‐Heterocyclic carbene‐catalyzed reactions of indolin‐3‐ones with 2‐bromoenals opened an asymmetric access to 3,4‐dihydropyrano[3,2‐b]indol‐2(5 H)‐ones in good yields and with good to excellent enantioselectivities. This protocol tolerates a broad substrate scope. In addition, a possible mechanism for the annulation reaction is presented.
吲哚-3-酮与2-溴烯的N杂环卡宾催化的反应打开了3,4-二氢吡喃[3,2 -b ]吲哚-2(5 H)酮的不对称通道,收率高且优异的对映选择性。该协议可容忍广泛的基材范围。此外,提出了一种可能的环化反应机理。