Formal Radical Cyclization onto Benzene Rings: A General Method and Its Use in the Synthesis of <i>e</i><i>nt</i>-Nocardione A
作者:Derrick L. J. Clive、Stephen P. Fletcher、Dazhan Liu
DOI:10.1021/jo030364k
日期:2004.5.1
An indirect method is described for effecting radical cyclization onto a benzene ring. Cross-conjugated dienones 6, which are readily prepared from phenols, undergo radical cyclization (6 → 7 → 8), and the products (8) are easily aromatized. The method has been applied to the synthesis of ent-nocardione A (21).
Formal radical cyclization onto benzene rings—a general method proceeding via cross-conjugated dienones
作者:Derrick L. J. Clive、Stephen P. Fletcher、(in part) Mingzhao Zhu
DOI:10.1039/b212223e
日期:2003.2.7
Cross-conjugated dienones of type 5 (X = I), which are readily available from phenols, undergo radical cyclization (5 â 6 â 7), and the products are easily aromatized (7 â 8), giving substances that are formally derived by radical cyclization onto a benzene ring (cf.eqn. (1)).