Synthesis of C-Ring Hydroxylated Neoflavonoids by Ligand Coupling Reactions
摘要:
Reaction of 4-trifluoromethanesulfonyloxycoumarin derivatives with benzyloxyphenylboronic acid derivatives under modified Suzuki reaction conditions afforded the corresponding neoflavones. Selective debenzylation took place in high yields when the palladium-catalysed hydrogenolysis was performed in the presence of acetic acid.
Synthesis of 4-arylcoumarins from Coutarea hexandra
作者:G Monache
DOI:10.1016/s0031-9422(00)81132-2
日期:——
Abstract The structures assigned to the 5,7-dimethoxy-4-arylcoumarins isolated fromCoutareahexandra have been confirmed by synthesis, via Pechmann condensation of phloroglucinol and an ethyl benzoylacetate derivative, the hydroxy groups of which were protected either by benzylation or by methylenedioxy group formation.
Synthesis of <i>C</i>-Ring Hydroxylated Neoflavonoids by Ligand Coupling Reactions
作者:Dervilla M.X. Donnelly、Jean-Pierre Finet、Patrick J. Guiry、Martin D. Rea
DOI:10.1080/00397919908086434
日期:1999.8.1
Reaction of 4-trifluoromethanesulfonyloxycoumarin derivatives with benzyloxyphenylboronic acid derivatives under modified Suzuki reaction conditions afforded the corresponding neoflavones. Selective debenzylation took place in high yields when the palladium-catalysed hydrogenolysis was performed in the presence of acetic acid.
Synthesis and Biological Evaluation of 4-Arylcoumarin Analogues of Combretastatins
A series of A-ring polymethoxylated neoflavonoids was prepared by ligand coupling reactions involving either Suzuki or Stille reactions. Cytotoxicity studies indicated a potent activity against a CEM leukemia cell line for the compounds presenting a substitution pattern related to that of combretastatin A-4. The two compounds having a 3'-OH and a 4'-OCH3 substituents on the 4-phenyl B-ring have no effect on human topoisomerases I and II but potently inhibit, in vitro, microtubule assembly. At the cell level, the active compounds were characterized as proapoptotic agents, but they can also trigger cell death via a nonapoptotic pathway.