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