A new strategy for the synthesis of biflavonoids via arylboronic acids.
摘要:
Amentoflavone derivatives were prepared by catalytic coupling of 8-flavoneboronic acids with iodoflavones. 3-Arylflavones, as biflavonoid synthon, are accessible by the method.
Total Synthesis of Robustaflavone, a Potential Anti-Hepatitis B Agent
作者:David E. Zembower、Heping Zhang
DOI:10.1021/jo981186b
日期:1998.12.1
Robustaflavone, a naturally occurring compound, is an inhibitor of hepatitis B virus replication in vitro. Robustaflavone is a biflavanoid composed of two units of apigenin (5,7,4'-trihydroxyflavone) joined via a biaryl linkage between the g-position of one unit and the 3'-position of the other (I6,II3'-biapigenin). The natural material was isolated from the seed-kernels of Rhus succedanea. To provide ready access to sufficient quantities of material for continued biological studies, as well as to provide a general route for the preparation of structural analogues, a total synthesis of robustaflavone was pursued. The total synthesis was approached by constructing apigenin ethers containing functionalities at the 6- and 3'-positions which could be cross-coupled using transition metal catalysis. Key steps of the synthesis included development of a regioselective iodination of an apigenin derivative at the 6-position. Also key was the formation of an apigenin 3'-boronate using a palladium-catalyzed exchange of the corresponding 3'-iodide with a diboron reagent. Finally, identification of appropriate reaction conditions for Suzuki coupling to form the sterically congested 6-3''' biaryl bond of robustaflavone provided access to the desired biflavanoid system. This work represents the first total synthesis of robustaflavone.
Nakazawa, Chemical and pharmaceutical bulletin, 1959, vol. 7, p. 748,749
作者:Nakazawa
DOI:——
日期:——
A novel Apigenin derivative suppresses renal cell carcinoma via directly inhibiting wild-type and mutant MET