Assembly of multicyclic isoquinoline scaffolds from pyridines: formal total synthesis of fredericamycin A
作者:Fang-Xin Wang、Jia-Lei Yan、Zhixin Liu、Tingshun Zhu、Yingguo Liu、Shi-Chao Ren、Wen-Xin Lv、Zhichao Jin、Yonggui Robin Chi
DOI:10.1039/d1sc02442f
日期:——
typically starts with benzene derivatives as substrates with the assistance of acids or transition metals. Disclosed here is a concise approach to prepare isoquinoline analogues by starting with pyridines to react with β-ethoxy α,β-unsaturated carbonyl compounds under basic conditions. Multiple substitution patterns and a relatively large number of functional groups (including those sensitive to acidic
A new approach for the formation of fused cyclooctane or cyclohexane rings
作者:George Majetich、Ken Hull、Richard Desmond
DOI:10.1016/s0040-4039(00)94902-5
日期:1985.1
The intramolecular regioselective addition of unsymmetrical allylsilanes to conjugated dienones is shown to permit facile entry into 5-6, 6-6, 5-8, and 6-8 bicyclic ring systems.
Ruthenium-Catalyzed Hydrative Cyclization of 1,5-Enynes
作者:Yiyun Chen、Douglas M. Ho、Chulbom Lee
DOI:10.1021/ja053462r
日期:2005.9.1
ruthenium-catalyzed hydrative cyclization of enynes has been developed. The reaction converts a range of 1,5-enynes bearing terminal alkyne and Michael acceptor moieties into cyclopentanone derivatives. From extensive catalyst screening experiments, a trinuclear ruthenium complex, [Ru3(dppm)3Cl5]PF6, has been identified to be an effective catalyst in mediating the 1,1-difunctionalization of alkynes. It is proposed