Palladium-Catalyzed Direct Arylation of 4-Chromanones: Selective Synthesis of Racemic Isoflavanones and 3,3-Diaryl-4-chromanones
作者:Fabio Bellina、Tiziana Masini、Renzo Rossi
DOI:10.1002/ejoc.200901356
日期:2010.3
yields and with high selectivity by Pd-catalyzed direct C-3 arylation of 3-unsubstituted 4-chromanones with aryl bromides with the aid of a Pd 2 (dba) 3 /tBu 3 PHBF 4 catalyst system in the presence of KHCO 3 as the base in a dioxane/water mixture (4:1). This catalyst system has also been employed in an unprecedented synthesis of 3,3-diaryl-4-chromanones through directarylation of 4-chromanones in
Donnelly, Dervilla M.X.; Finet, Jean-Pierre; Stenson, Paul H., Heterocycles, 1989, vol. 28, # 1, p. 15 - 18
作者:Donnelly, Dervilla M.X.、Finet, Jean-Pierre、Stenson, Paul H.
DOI:——
日期:——
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