Enantioselective Palladium-Catalyzed Carbene Insertion into the N−H Bonds of Aromatic Heterocycles
作者:Vanessa Arredondo、Stanley C. Hiew、Eugene S. Gutman、Ilandari Dewage Udara Anulal Premachandra、David L. Van Vranken
DOI:10.1002/anie.201611845
日期:2017.4.3
C3‐substituted indoles and carbazoles react with α‐aryl‐α‐diazoesters under palladium catalysis to form α‐(N‐indolyl)‐α‐arylesters and α‐(N‐carbazolyl)‐α‐arylesters. The products result from insertion of a palladium‐carbene ligand into the N−H bond of the aromatic N‐heterocycles. Enantioselection was achieved using a chiral bis(oxazoline) ligand, in many cases with high enantioselectivity (up to 99 %
C3取代的吲哚和咔唑在钯催化下与α-芳基-α-重氮酯反应形成α-(N-吲哚基)-α-芳基酯和α-(N-咔唑基)-α-芳基酯。产物是由钯-卡宾配体插入芳族N-杂环的NH键中产生的。使用手性双(恶唑啉)配体实现对映体选择性,在许多情况下具有高对映体选择性(最高99%ee)。该方法用于简明合成生物活性咔唑衍生物的核心。