Structures of the oat root resistance factors to ‘take-all’ disease, avenancins A-1, A-2, B-1 and B-2 and their companion substances
作者:Leslie Crombie、W. Mary L. Crombie、Donald A. Whiting
DOI:10.1039/p19860001917
日期:——
It is shown that avenestergenins, having a 12-oxo group, are not true aglycones of the avenacin series: the latter are 12, 13β-epoxides. Acid hydrolysis would be expected to lead to a 13α, 12-ketone, not the 13β, 12-ketone of the avenestergenins, and the chemistry of the process is modelled using the 12α, 13α- and 12β, 13β-epoxides from 3β-benzoyloxyolean-12-ene and isolating the 13α, and 13β, 12-ketones
已显示具有12-氧代基团的avenestergenins不是真正的avenacin系列糖苷配基:后者是12、13β-环氧化物。预计酸水解会产生avenestergenins的13α,12-酮而不是13β,12-酮,并且该过程的化学过程是使用来自3β-苯甲酰氧基油酸酯的12α,13α-和12β,13β-环氧化合物建模的-12-烯并分离13α和13β12酮。前者在酸性条件下很容易转化为后者,类似于酸性蛋白的水解。燕麦提取物的搜寻已导致分离出名为acavenavenagenin A-1的avenacin A-1系列真正的游离糖苷配基。