Two new ent -kaurane-type diterpene glycosides from zucchini ( Cucurbita pepo L.) seeds
摘要:
Two new enr-kaurane diterpene glycosides; 12 alpha-(beta-D-glucopyranosyloxy)-7 beta-hydroxykaurenolide (1) and 7 beta-(beta-D-glucopyranosyloxy)-12 alpha-hydroxykaurenolide (2), a new steroid; (249-stigmasta-7,22E,25-trien-3-one (12), and known compounds (3-11, 13-14) were isolated from zucchini (Cucurbita pepo L.) seeds. The absolute structures of 1 and 2 were determined by acid hydrolysis and application of a modified Moscher's method. Furthermore, isolated compounds (1-14), and a derivative, la, were evaluated for their inhibitory effects on macrophage activation by an inhibitory assay of nitric oxide (NO) production. (C) 2015 Elsevier B.V. All rights reserved.
Two new enr-kaurane diterpene glycosides; 12 alpha-(beta-D-glucopyranosyloxy)-7 beta-hydroxykaurenolide (1) and 7 beta-(beta-D-glucopyranosyloxy)-12 alpha-hydroxykaurenolide (2), a new steroid; (249-stigmasta-7,22E,25-trien-3-one (12), and known compounds (3-11, 13-14) were isolated from zucchini (Cucurbita pepo L.) seeds. The absolute structures of 1 and 2 were determined by acid hydrolysis and application of a modified Moscher's method. Furthermore, isolated compounds (1-14), and a derivative, la, were evaluated for their inhibitory effects on macrophage activation by an inhibitory assay of nitric oxide (NO) production. (C) 2015 Elsevier B.V. All rights reserved.
Die Synthese von 5α‐Stigmastatrien‐(7. 22.25)‐ol‐(3β)
作者:Wolfgang Sucrow、Björn Girgensohn
DOI:10.1002/cber.19701030314
日期:1970.3
bei der Claisen-Umlagerung mit dem keten-O.N-acetal5 das Amid 7 ergibt. Lithiumalanatreduktion und CopeAbbau führen zum Titelsterin 1. Aus den epimeren Formen von 4 erhält man in stereospezifischer Reaktion die beiden 24-epimeren Sterine 1. Die Stereochemie der Claisen-Umlagerung wird diskutiert.
达斯Äthinylcarbinol 3 AUS3β乙酰氧基22.23-DINOR-5α-cholen-(7)-aldehyd(2)UND Butin-(1)-ylmagnesiumbromid wird的Zum Allylalkohol 4 hydriert,DER贝DER克莱森-Umlagerung MIT DEM keten- Ò。N-缩醛5 das Amid 7 ergibt。锂钛酸还原和应对Titelsterin 1。AUS巢穴epimeren福曼冯4 erhält男性在stereospezifischer Reaktion模具beiden 24 epimeren Sterine 1。Die Stereochemie der Claisen -Umlagerung wird diskutiert。