作者:Lucien D. Caspers、Peter Finkbeiner、Boris J. Nachtsheim
DOI:10.1002/chem.201606026
日期:2017.2.24
Unprotected aromatic amines can be used as directing groups in metal‐catalyzed C−H alkynylations of alkenes. By using low amounts of an IrIII catalyst in combination with alkynylbenziodoxolones as electrophilic alkyne‐transfer reagents, highly desirable 1,3‐enynes were isolated in excellent yields of up to 98 % with Z stereoselectivity. A broad substrate scope as well as the high synthetic utility
未保护的芳族胺可用作金属在烯烃的CH-H炔基化反应中的导向基团。通过使用少量的Ir III催化剂与炔基苯并恶唑烷酮作为亲电炔转移试剂,可以分离出非常理想的1,3-炔烃,Z立体选择性高达98%。广泛的底物范围以及1,3-烯炔的高合成效用使该新方法成为合成五元和六元杂环的有效方法。通过Au I-和N-溴代琥珀酰亚胺介导的exo-dig环化反应,进一步证明了1,3-烯炔进一步衍生为高度取代的喹啉。