Cp*Co(III)-Catalyzed C(8)-Nucleophilic Cascade Cyclization of Quinoline <i>N</i>-Oxide with 1,6-Enyne
作者:Bholanath Garai、Molla Rahamat Ali、Rajib Mandal、Basker Sundararaju
DOI:10.1021/acs.orglett.3c00305
日期:2023.3.31
yields and excellent functional group tolerance. The utility of the protocol has been accomplished by post-synthetic modification of the cyclized product. The mechanistic studies indicate a base-assisted internal electrophilic-type substitution (BIES)-type pathway for C–H bond activation, and electrospray ionization mass spectrometry (ESI–MS) analysis of the stoichiometric reaction confirmed the formation
C(8)-选择性亲核级联环化喹啉N-氧化物与容易从苯酚衍生物衍生的 1,6-烯炔被证明。发现多种喹啉N-氧化物和炔烃适用于生产喹啉N-氧化物栓系顺式库-氢化苯并呋喃,具有高产率和优异的官能团耐受性。该协议的实用性已通过环化产品的合成后修饰来实现。机理研究表明 C-H 键活化的碱基辅助内部亲电型取代 (BIES) 型途径,化学计量反应的电喷雾电离质谱 (ESI-MS) 分析证实了关键的五元结构的形成钴环。