480-18-2 + 153666-25-2 = 79995-67-8 + 649552-43-2 + 649552-41-0 + 37971-67-8 + 649552-45-4 + 74628-44-7 + 80453-44-7 + 649552-44-3 反应条件:1.1 Solvents: Diethyl Ether,Benzene; 9 D,4 °C 标题:Methylation Of Dihydroquercetin Acetates: Synthesis Of 5-O-Methyldihydroquercetin 作者:Kiehlmann,Eberhard; Et Al 参考文献:Journal Of Natural Products 日期:2003 卷标:66(12) 页码:1562-1566
📜重氮甲烷,花旗松素 以 乙醚,苯 作为反应溶剂,化学反应 1.5H,以28%的收率获得产物李属素 参考文献:Structure-activity Relationship For (+)-Taxifolin Isolated From Silymarin As An Inhibitor Of Amyloid β Aggregation 标题:Structure-activity Relationship For (+)-Taxifolin Isolated From Silymarin As An Inhibitor Of Amyloid β Aggregation 摘要:Silymarin,The Seed Extract Of Silybium Marianum,Has Preventive Effects Against Alzheimer'S Disease-Like Pathogenesis In Vivo. We Isolated (+)-Taxifolin (4) From Silymarin As An Inhibitor Of Aggregation Of The 42-Residue Amyloid Beta-Protein. Structure-Activity Relationship Studies Revealed The 3',4'-Dihydroxyl Groups To Be Critical To The Anti-Aggregative Ability,Whereas The 7-Hydroxyl Group And The Stereochemistry At Positions 2 And 3 Were Not Important. DOI:10.1271/bbb.120925
参考标题:Methylation Of Dihydroquercetin Acetates: Synthesis Of 5-O-Methyldihydroquercetin 作者:Eberhard Kiehlmann,Peter W. Slade |发布日期:2003.12.1 摘要:The Major Products Of Methylation Of Dihydroquercetin (1, Dhq) With Diazomethane Have Been Identified As 7-O-Methyldhq (9), 7,3'-Di-0-Methyldhq (10), 7,4'-Di-O-Methyldhq (11), And 7,3',4'-Tri-O-Methyldhq (2). With Dhq 3,7,3',4'-Tetraacetate (6), Dhq 3,5,3',4'-Tetraacetate (5), Dhq 3,3',4'-Triacetate (7), Dhq 7,3',4'Triacetate (8), And Dhq 3-Acetate (4) The Same Reaction Affords Mainly 5-O-Methyldhq 3,7,3',4'-Tetraacetate (15), 7-O-Methyldhq 3,5,3',4'-Tetraacetate (13), 7-O-Methyldhq 3,3',4'-Triacetate (14), 5-O-Methyldhq 7,3',4'Triacetate (25), And 7-O-Methyldhq 3-Acetate (12), Respectively. The Methylation Of 8 Is Accompanied By Intermolecular Acetyl Migration From Phenolic Oxygen To The Hydroxy Group Of The Heterocyclic Ring. 5-O-Methyldhq (28) Is Accessible By Deacetylation Of 25. 5,7-Di-O-Methyldhq (29), Four Known Methyl Ethers, 13 New And Three Known Methyl Ether Acetates Of Dhq, And Six New Isomers With 2,3-Cis Stereochemistry Were Spectroscopically Identified.
合成参考文献
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