阿尔茨海默病 (AD) 是一种多因素病理,需要能够解决其特殊性质的多方面药物。越来越多的证据表明,淀粉样蛋白 β (Aβ) 的聚集和氧化应激密切相关,它们的调节可能在对比 AD 相关损伤方面具有积极和协同作用。在此,从合适的酪醇结构单元开始,利用成熟的亚磷酰胺化学,开发了一种新的、基于片段的、基于片段的酪醇磷酸二酯衍生物(TPDs)方法。已经测试了新 TPD 的抗氧化活性以及它们抑制 Aβ 蛋白聚集的能力。此外,它们的金属螯合能力已被评估为开发新的天然实体以预防或治疗 AD 的可能策略。40和强大的螯合生物金属如 Cu II和 Zn II 的能力。
distributed in naturalproducts and play a central role in bioactivities. Herein, we disclose an efficient, mild, and general esterification approach to the synthesis of these esters by employing gold(I)-catalyzed acylation reaction with alkyne-tethered mixed anhydrides and alcohols. This method can be applied to ester-bond formation in complex substrates and facilitates efficient synthesis of acteoside
electrophilic amination of Grignardreagents with benzophenone O-sulfonyloxime derivatives. 4,4′-Bis(trifluoromethyl)benzophenone O-sulfonyloximes react with alkyl Grignardreagents in the presence of a catalytic amount of CuCN in tetrahydrofuran-hexamethylphosphoric triamide to give N-alkylimines, which are readily hydrolyzed to primary amines. 3,3′,5,5′-Tetrakis(trifluoromethyl)benzophenone O-p-tolylsulfonyloxime
A general synthetic strategy and the anti-proliferation properties on prostate cancer cell lines for natural phenylethanoid glycosides
作者:Shaheen K. Mulani、Jih-Hwa Guh、Kwok-Kong Tony Mong
DOI:10.1039/c3ob42503g
日期:——
A general strategy for the synthesis of phenylethanoid glycosides (PhG) including echinacoside 1, acteoside 2, calceolarioside-A 3 and calceolarioside-B 4 is reported. The strategy features the application of low substrate concentration glycosylation and N-formyl morpholine modulated glycosylation methods for the construction of 1,2-trans β- and α-glycosidic bonds. The reported strategy does not invoke the use of the participatory acyl protecting function, which is incompatible with the ester function present in target PhG compounds. A preliminary study of the anti-proliferation properties of the PhG compounds 1–4 was performed; the acteoside 2 exhibited the best inhibition on the prostatic cancer cell proliferation.
disease. Rosmarinic acid, which is one of the main aggregation inhibitors derived from Lamiaceae, was employed as a lead compound and its 25 derivatives were synthesized. In this study, the structure–activityrelations of rosmarinic acid derivatives for the amyloid-β aggregation inhibitory effect (MSHTS assay), antioxidant properties, and xanthine oxidase inhibition were evaluated. Among the tested compounds