Quantitative structure-activity relationship of estrogen activities of bisphenol A analogs

BISPHENOL A (4,4-ISOPROPYLIDENEDIPHENOL, BPA) IS MANUFACTURED IN HIGH QUANTITIES, WITH 90% OR MORE BEING USED AS A MONOMER FOR THE PRODUCTION OF POLYCARBONATE AND EPOXY RESINS, UNSATURATED POLYESTER-STYRENE RESINS AND FLAME RETARDANTS. THE FINAL PRODUCTS …     

液相色谱-串联质谱法测定固体及液体药物中27种新型毒品芬太尼类物质

采用QuEChERS法及固相萃取(SPE)法净化样品,结合液相色谱-串联质谱(LC-MS/MS),建立了固体和液体药物中27种新型毒品芬太尼类物质(芬太尼类似物和代谢物)的测定方法。分析物采用电喷雾离子源,正离子多反应监测(MRM)模式检测,外标法定量。结果表明,27种芬太尼类物质在0.5～50.0μg/L质量浓度范围内呈良好线性关系,相关系数(r~2)均大于0.99,方法的定量下限为10.0μg/kg(固体药物)、10.0μg/L(液体药物);3个加标水平的回收率为84.8%～109%;相对标准偏差(RSD)为0.86%～8.5%。该方法快速简便,耗时短,灵敏度高,稳定性好,可用于药物中芬太尼类物质的定性鉴定及定量检测,有助于落实我国对该类物质的整类列管。     

Rational Design and Engineering of Nanomaterials Derived from Prussian Blue and Its Analogs for Electrochemical Water Splitting

Electrochemical water splitting (EWS) is a sustainable and promising technology for producing hydrogen as an ideal energy carrier to address environmental and energy issues. Developing highly‐efficient electrocatalysts for hydrogen and oxygen evolution reactions (HER and OER) is critical for increasing the efficiency of water electrolysis. Recently, nanomaterials derived from Prussian blue (PB) and its analogs (PBA) have received increasing attention in EWS applications owing to their unique composition and structure properties. In this Minireview, the latest progress of PB/PBA‐derived materials for EWS is presented. Firstly, the catalyst design principles and the advantages of preparing electrocatalysts with PB/PBA as precursors are briefly introduced. Then, strategies for enhancing the electrocatalytic performance (HER, OER or overall water splitting) were discussed in detail, and the recent development and applications of PB/PBA‐derived catalysts for EWS were summarized. Finally, major challenges and possible future trends related to PB/PBA‐derived functional materials are proposed.     

Synthesis of N‐Glycoside Analogs via Thionolactones

Indolyl N‐glycoside analogs were obtained by a two‐step sequence via indole N‐thioamides. Treatment of thionobutyrolactone with indolylmagnesium bromide provides the corresponding indole N‐thioamide. The use of 10:1 toluene:THF as solvent is important in favoring N‐ over C3‐acylation. Treatment of the ω‐hydroxythioamide with 2 equiv of Meerwein's reagent followed by sodium borohydride gives the corresponding N‐(tetrahydrofuranyl)indole. Addition of carbon nucleophiles gives access to ketose nucleoside analogs, while activation of the ω‐hydroxyl group can give access to tetrahydrothiophene N‐glycosides.     

Novel Synthetic Route Toward Benzofuran-pyridine–Based Spirans

A novel domino reaction of tetrahydrobenzofuro[3,2-c] or [2,3-c]pyridines with dimethylacetylene dicarboxylate (DMAD) or methyl propiolate (MP) resulted in the formation of spirobenzofuranpyridines in moderate yields. The spirobenzofuran derivatives reported may be considered analogs of the antifungal drug griseofulvin.     

Synthesis of a diversifiable cis-dehydrodecalin scaffold based on meiogynin A

A highly endo selective Diels-Alder reaction provides efficient access to the substituted cis-dehydrodecalin core structure of meiogynin A. Elaboration into the fully functionalized scaffold was achieved in three steps from cycloadduct 20a. This strategy is amenable to the synthesis of diversely substituted meiogynin analogs for the discovery of novel inhibitors of Bcl-xL and related anti-apoptotic proteins.     

Click chemistry and biocatalysis for the preparation of pancratistatin analogs

Tricyclic compounds that are advanced precursors for the synthesis of analogs of the antitumoral alkaloid pancratistatin were prepared by a short sequence that involved enzymatic dihydroxylation, epoxidation, and intramolecular Huisgen cycloaddition.