- Flavonoids of Polygonum sieboldi and P. filiforme
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Five flavonoids containing a new flavonol glycoside were isolated from Polygonum sieboldi and P. filiforme.The structure of the new compound was determined as quercetin 3-rhamnoside 2"-gallate by chemical and spectroscopic data.
- Isobe, Takahiko,Kanazawa, Keiji,Fujimura, Makoto,Noda, Yukinao
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- A new method for preparing engelhardtia leaves fall (by machine translation)
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The invention relates to a raw material synthesis method of medicine, in particular to a new method for preparing engelhardtia leaves off. In order to solve the problems of the prior art fall bride extracted from plants [...], because the content of the new engelhardtia leaves drop lower, using the extraction method is very difficult to obtain a good yield of the product, and the plant waste of resources and solvent is large the technical problem, the present invention provides a method of synthesizing new engelhardtia leaves fall, to [...] as the starting material, first hydrogenation to obtain the dihydro [...], then in certain alkaline conditions, hydrolysis reaction, generating hydroxy acetophenone intermediate (2 - (3, 4, 5 - trihydroxy - 6 - methyl four hydrogenation - 2 - chromene) - 1 - (2, 4, 6 - trihydroxy phenyl) - acetyl), with 3, 4 - dihydroxy benzaldehyde catalytic cyclization, generating fall bride [...], final refining receive quality content of 98% or more of the new woman [...]. Prepared by the method of the new engelhardtia leaves falling, raw materials are easy, simple operation, low cost, and is suitable for industrial production. (by machine translation)
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Paragraph 0042; 0048-0053; 0058-0062; 0063; 0069-0073; 0074
(2019/03/06)
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- QUERCETIN-3-O-α-, AN AGLYCONE-LIKE FLAVONOL GLYCOSIDE FROM LIBOCEDRUS BIDWILLII
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Quercetin-3-O-α-, a new natural product with unusual mixed acylation, has been found accompanying the biflavonoids in L. bidwillii.Aglycone-like chromatographic properties resulted in this compound being missed in the initial chemotaxonomic screening of flavonoid glycosides in Libocedrus, Key Word Index - Libocedrus bidwillii; Cupressaceae; leaf; quercetin 3-O-rhamnoside; mixed acylation; p-coumaroyl; p-hydroxybenzoyl; aglycon-like.
- Franke, Adrian,Markham, Kenneth R.
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p. 3566 - 3568
(2007/10/02)
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