The chemistry of pentavalent organobismuth reagents
作者:Derek H.R. Barton、Dervilla M.X. Donnelly、Jean-Pierre Finet、Paul H. Stenson
DOI:10.1016/s0040-4020(01)89826-4
日期:——
The arylation of chroman-4-one and 4-hydroxycoumarin derivatives by pentavalent arylbismuth reagents has been carried out. Chroman-4-one gives the 3-diphenyl derivative, whereas 3-formyl and 3-oxalyl derivatives are phenylated to isoflavanones in moderate to high yields. Arylation of 4-hydroxycoumarins by various Bi(V) reagents gives rise to functionally substituted 3-aryl-4-hydroxycoumarins in high