Structures of the four avenacins, oat root resistance factors to ‘take-all’ disease
作者:Leslie Crombie、W. Mary L. Crombie、Donald A. Whiting
DOI:10.1039/c39840000246
日期:——
The true aglycones of the avenacins are acid sensitive triterpene 12,13-epoxides, not 12-ketones, and one such avenestergenin epoxide is isolated direct fromoatroots; this, together with study of the attached trisaccharide, permits complete structures to be proposed for the four avenacins (3a—d); avenestergenins readily undergo an acid-catalysed anhydrodimerisation via acetal formation.