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Dunawithanines A and B,the first withanolide glycosides from Dunalia australis
Authors:Günter Adam  Nguên Quyêt́ Chiêń  Nguyên Hûu Khôi
Institution:Institute of Plant Biochemistry, Academy of Sciences of the GDR, Halle/Saale, German Democratic Republic
Abstract:Withanolide D, 7β-acetoxy-withanolide D and two new withanolide glycosides, named dunawithanines A and B, were isolated from Dunalia australis. From physical data and chemical transformations, the structures of the new compounds were determined as (20R,22R-O(3)-2′,3′-di-O-(β-D-glucopyranosyl)-β-D-glucopyranosyl]-3β,20-dihydroxy-1α-acetoxy-witha-5,24-dienolide and the corresponding O(3)-β-D-glucopyranosyl(1′ → x)-β-D- glucopyranosyl] compound, representing the first withanolide glycosides found in the plant kingdom.
Keywords:Solanaceae  withanolide glycosides  steroidal lactones  dunawithanines A and B
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