نتایج جستجو برای: 22 دیان 3 o d α گلیکوپیرانوزید

تعداد نتایج: 2875963  

2014
Sarkar M. A. Kawsar Md O. Faruk Mohammad S. Rahman Yuki Fujii Yasuhiro Ozeki

A regioselective acylation series of methyl α-D-glucopyranoside (1), methyl 3-O-benzoyl-4,6-O-benzylidene-α-D-mannopyranoside (1A), and methyl 4,6-O-benzylidene-2-O-(3,5-dinitrobenzoyl)-α-D-mannopyranoside (1B) has been carried out by the direct acylation method and afforded the 2,6-di-O-glucopyranoside and 2 or 3-O-mannopyranoside derivatives in an excellent yield. In order to obtain newer pro...

2011
Qiurong Zhang Xuebin Chen Nan Zhu Tengfei Jiang Hongmin Liu

The title compound, C(23)H(22)O(8), is a binary benzoyl ester whose nucleus consists of a fused system made up of a methyl-enedi-oxy ring and two tetra-hydro-furan rings. One of the benzoyl ester groups is attached at the junction of the two tetra-hydro-furan rings. The other is attached to the outer tetra-furan ring. Both the benzoyl ester groups are in an axial conformation with respect to th...

Journal: :Vietnam Journal of Science, Technology and Engineering 2023

Solanum melongena is a member of genus that widely cultivated as fruit vegetable in Vietnam. According to Vietnamese traditional medicine, the fruits and whole plants are used treat toothache, turgescence, pruritus, haemorrhoids. As part our project study chemical composition bioactivity Vietnam, five flavonoid glycosides including kaempferol-3-O-β-D-glucopyranoside (1), isovitexin (2), kaempfe...

2009
Anja Burkhardt Lars Eriksson Göran Widmalm Ian Cumpstey

The title compound, C(19)H(25)NO(6), is a Z diastereomer in which the phenyl ring of the 3-benzyl-oxime substituent and the 5,6-O-isopropyl-idene acetal are both located on the Si-face of the C=N double bond. Inter-molecular C-H⋯O inter-actions result in helical chains along the b axis of the monoclinic unit cell.

Journal: :Molecules 2011
Wen-Wei Fu Jin-Nan Fu Wen-Meng Zhang Li-Xin Sun Yue-Hu Pei Ping Liu

A new unusual minor triterpenoid saponin, platycoside O (1), was isolated from the 75% EtOH extract obtained from the roots of Platycodon grandiflorum, together with four known saponins: platycoside M-3 (2), platycoside J (3), platycoside F (4) and platycoside B (5). The structure of 1 was determined as 3-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl-2β,3β,16α,23-tetrahydroxyolean-12-en-24-meth...

Journal: :Molecules 2015
Yang Xie Jing Wang Yan-Mei Geng Zhi Zhang Yan-Fei Qu Guang-Shu Wang

Seven phenolic compounds were isolated from the fruits of Viburnum sargentii Koehne by silica gel column chromatography and preparative HPLC. On the grounds of chemical and spectroscopic methods, their structures were identified as (-)-Epicatechin (1), 5,7,4'-trihydroxy-flavonoid-8-C-β-D-glucopyranoside (2), 1-(4-hydroxy-3-methoxyphenyl)-2-[4-(3-α-L-rhamnopyranoxypropyl)-2-methoxyphenoxy]-1,3-p...

Journal: :Agricultural and Biological Chemistry 1969

Journal: :Molecules 2015
Chang-Wei Li Hua-Jin Dong Cheng-Bin Cui

Twelve galloyl glucosides 1-12, showing diverse substitution patterns with two or three galloyl groups, were synthesized using commercially available, low-cost D-glucose and gallic acid as starting materials. Among them, three compounds, methyl 3,6-di-O-galloyl-α-D-glucopyranoside (9), ethyl 2,3-di-O-galloyl-α-D-glucopyranoside (11) and ethyl 2,3-di-O-galloyl-β-D-glucopyranoside (12), are new c...

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