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 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 <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.