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
Synthesis of a Cyclopent[g]isoquinoline Building Block for Fredericamycin A
作者:Manfred Braun、Gwenaëlle Kergoët、Fabian Kruska、Walter Frank
DOI:10.1055/s-0029-1218744
日期:2010.6
A new route to the DEF-ring building block of fredericamycin A has been elaborated. The five-step synthesis involves a photo-Wolff reaction as the key step and leads to carboxylic acid 2 in 27% overall yield, starting from the pyridine derivative 3. Two intermediates, the tricyclic ketones 6a and 7, are characterized by crystal structure analyses. heterocycles - rearrangement - diazo compounds - annulation