Mechanistic Dichotomy with Alkynes in the Formal Hydrohydrazination/Fischer Indolization Tandem Reaction Catalyzed by a Ph3PAuNTf2/pTSA Binary System
作者:Nitin T. Patil、Ashok Konala
DOI:10.1002/ejoc.201001114
日期:2010.12
method involving a formal hydrohydrazination/ Fischer indolization tandem reaction to synthesize 2,3-disubstituted indoles from alkynes and arylhydrazines has been developed. The approach uses a Ph 3 PAuNTf 2 /pTSA·H 2O binary catalytic system in which a very low catalyst loading of Ph 3 PAuNTf 2 (2 mol-%) is required. The reaction time is very short and, most importantly, the reaction is not sensitive
已经开发了一种有效的方法,包括正式的氢化肼/Fischer 吲哚化串联反应,以从炔烃和芳基肼合成 2,3-二取代吲哚。该方法使用Ph 3 PAuNTf 2 /pTSA·H 2O 二元催化系统,其中需要非常低的Ph 3 PAuNTf 2 (2 mol-%)催化剂负载。反应时间很短,最重要的是,反应对水分不敏感。已经研究了这些反应的机制,结果使我们提出了一个有趣的机制二分法。当炔烃在系链中具有 OH/COOH 基团时,发生加氢烷氧基化/加氢羧化以生成环外烯醇醚/内酯,与肼反应生成吲哚。在炔烃缺少 OH/COOH 基团的情况下,