Synthesis of condensed tannins. Part 7. Angular [4,6 : 4,8]-prorobinetinidin triflavanoids from black wattle (‘Mimosa’) bark extract
作者:Phillip M. Viviers、Jacobus J. Botha、Daneel Ferreira、David G. Roux、Henry M. Saayman
DOI:10.1039/p19830000017
日期:——
The triflavanoid fraction from the bark extract of the black wattle (Acacia mearnsii) comprises five angular prorobinetinidins with their constituent robinetinidol units [4,6 : 4,8]-linked to both (+)-catechin and (+)-gallocatechin. Synthetic proof of structure is provided for three bi-[(–)-robinetinidol]-(+)-catechin diastereoisomers. The complete dominance of prorobinetinidins in the higher oligomeric
来自黑荆树(Acacia mearnsii)的树皮提取物中的三类黄酮级分包含五个角蛋白原蛋白,其构成的Robinetinidol单元[4,6:4,8]与(+)-儿茶素和(+)-gallocatechin均相连。提供了三种双[[-]-robinetinidol]-(+)-儿茶素非对映异构体的结构综合证明。与竞争性(+)-亮氨酸非setinidin相比,较高的寡聚级分中的prorobinetinidins的完全优势与亲本(+)-leurobrobinetinidin与亲核底物的更快缩合速率相关。