Microwave-assisted synthesis and antimicrobial activities of flavonoid derivatives
作者:Sherif B. Abdel Ghani、Louise Weaver、Zidan H. Zidan、Hussein M. Ali、C. William Keevil、Richard C.D. Brown
DOI:10.1016/j.bmcl.2007.11.081
日期:2008.1
Eleven flavonoid derivatives were synthesised using a modified Baker-Venkataraman rearrangement, and subsequent microwave-assisted closure of the heterocyclic ring. All of the synthetic compounds displayed antifungal activity against Aspergillus niger and Fusarium oxysporium, and two of the synthetic flavonoid analogues exhibited significant activity against methicillin-resistant Staphylococcus aureus
A visible-light-induced photocatalytic strategy for the synthesis of flavonoids has been developed through the deoxygenative/cyclization reaction of salicylic acid derivatives with aryl acetylene using diphenyl sulfide as an O-transfer reagent. Based on the controlled experiments, the mechanism of visible-light-induced free radical coupling cyclization was proposed. The protocol obtained 51 flavonoids
cleavage/intramolecular 6-endo-dig annulation/hydrocarbonylation for the synthesis of the valuable 2-aryl-4H-chromen-4-ones is described. This practical synthesis strategy utilizes propargylamines and air as the oxygen source and green carbonylation reagent, in which propargylamines are activated by the inexpensive and available dimethyl 2,2′-azobis(2-methylpropionate) (AIBME) and (PhSe)2 as the radical initiators
The invention relates to a rubber composition and a pneumatic tire having a component comprising a rubber containing the reaction product of a flavone and a methylene donor.
Rubber composition and tire with rubber containing flavone
申请人:The Goodyear Tire & Rubber Company
公开号:EP2730431A1
公开(公告)日:2014-05-14
A rubber composition comprising a diene based elastomer and an adhesion promoter derived from a flavone, a methylene donor and a methylene acceptor is disclosed. The rubber composition is essentially free of cobalt. Also, a pneumatic tire comprising such a rubber composition is disclosed.