Regioselective Synthesis of Isoquino[1,2-<i>b</i>][3]benzazepines (Homoprotoberberines) through 11-Membered-Ring Stilbene Lactams Obtained by Radical Macrocyclization
作者:Gema Rodríguez、Luis Castedo、Domingo Domínguez、Carlos Saá、Waldemar Adam
DOI:10.1021/jo9901900
日期:1999.6.1
Silylated 11-membered-ring stilbene lactams 3 (E and Z) were easily prepared by intramolecular addition of an aryl radical to a trimethylsilylacetylene. Oxidation of their hindered stilbene double bonds with dioxiranes gave oxidative cleavage of their electron-rich aromatic rings. However, reduction of the amide to an amine functionality in both lactams (E and Z) triggers a regioselective [7,6]-transannular