文献类型： 外文期刊

第一作者： Ning, J

作者： Ning, J;Kong, FZ;Lin, BM;Lei, HD

作者机构：

关键词： phytoalexin elicitor;glucohexatose;green pesticide

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

ISSN： 0021-8561

年卷期： 2003 年 51 卷 4 期

页码：

收录情况： SCI

摘要： Large-scale preparation of the phytoalexin elicitor was achieved through a highly regio- and sterereoselective synthesis using 2,3,4,6-tetra-O-benzoyl-D-glucopyranosyl trichloroacetimidate (1), 1,2:5,6-di-O-isopropylidene-alpha-D-glucofuranose (2), and 6-O-acetyl-2,3,4-tri-O-benzoyl-alpha-D-glucopyranosyl trichloroacetimidate (3) as the synthons. Coupling of 1 with 2 gave the 1-->3-linked disaccharide; subsequent selective removal of 5,6-O-isopropylidene to give 5 followed by selective 6-O-glycosylation with 1 afforded the trisaccharide 6. Hydrolysis to remove the 1,2-O-isopropylidene was accompanied by ring expansion, giving 3,6-branched pyranosyl trisaccharide. Acetylation, selective 1-O-deacetylation, and activation with trichloroacetonitrile gave the trisaccharide donor 7. The trisaccharide acceptor 9 was prepared from condensation of the disaccharide 5 with 3 and subsequent 6-O-deacetylation. Coupling of the trisaccharide donor 7 with the trisaccharide acceptor 9 and subsequent deprotection afforded the glucohexatose elicitor. The cost of the produced glucohexatose should be low enough to allow its applications in agriculture as a green pesticide. At a concentration of 5-10 mg/L, the resultant elicitor was used to treat growing orange trees and harvested oranges, giving very encouraging results, comparable with those obtained using commercial pesticides at a concentration of 1400 mg/L (Topsin-M) for growing trees and 900 mg/L (Tecto) for harvested oranges, respectively. Treatment of tomato leaves against Botrytis cinerea with the synthetic elicitor at a concentration of 10 mg/L gave 82% inhibition, comparable with the inhibition of 84% by Wanmeiling at a concentration of 1000 mg/L. Treatment of tea leaves also showed promising results.

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