REACTION OF DEHYDROELLAGITANNINS WITH L-CYSTEINE METHYL ESTER
Reaction of dehydroellagitannins (e.g. 1) with L-cysteine methyl ester (5) at room temperature yielded the condensation products (e.g. 3 and 4), together with a partial hydrolysate (e.g. 2), while heating the mixture at 80 deg C afforded 4 and the hydrolysate (2) in fairly good yields.In addition, reduction of a dehydrohexahydroxydiphenoyl ester group to a hexahydroxy-diphenoyl group with thiols is also described.
Tannins and related compounds. C. Reaction of dehydrohexahydroxydiphenic acid esters with bases, and its application to the structure determination of pomegranate tannins, granatins A and B
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Tanaka,Nonaka,Nishioka
p. 2424 - 2428
(2007/10/02)
The Metabolism of Gallic Acid and Hexahydroxydiphenic Acid in Plants. Part 3. Esters of (R)- and (S)-Hexahydroxydiphenic Acid and Dehydrohexahydroxydiphenic acid with D-Glucopyranose (1C4 and Related Conformations)
In a small group of plants a process of further metabolism of galloyl-D-glucose esters occurs in which oxidative coupling takes place between galloyl ester groups in the 1,6:2,4 or 3,6-position of D-glucopyranose in its least favoured 1C4
Haddock, Elizabeth A.,Gupta, Raj K.,Haslam, Edwin
p. 2535 - 2546
(2007/10/02)
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