Improved synthesis, X-ray structure, and antifungal activity of a sugar-psoralen conjugate: 4,4′-Dimethylxanthotoxol 2,3,4,6-tetra-<i>O</i>-Acetyl-<i>β</i>-<i>D</i>-glucoside
作者:Chao-Yue Chen、Ting-Hai Yang、Chang-Duo Pan、Xin Wang
DOI:10.1080/07328303.2019.1609018
日期:2019.3.24
An improved synthesis for 4,4 '-dimethylxanthotoxol 2,3,4,6-tetra-O-acetyl-beta-D-glucoside (1) starting from resorcinol was developed. Crystallographic analysis of glucoside 1 indicated that the dihedral angles between the mean planes of the tricyclic ring system of adjacent molecules was 54.820(22)degrees probably due to the steric hindrance caused by the bulky O-glucoside moiety, which prevents the molecules from packing via pi center dot center dot center dot pi stacking between the tricyclic cores. The antifungal screening data revealed that glucoside 1 had higher inhibition than its parent compound 4,4 '-dimethylxanthotoxol and azoxystrobin against Rhizoctonia solani, Pyricularia grisea, and Alternaria alternate Japanese pear pathotype, with the inhibitory rates of 75.4, 65.7 and 70.1%, respectively, at the 50 mu g/mL concentration.[GRAPHICS].