Euglobal-IIIa, a novel acylphloroglucinol-sesquiterpene derivative from Eucalyptus robusta: absolute structure and cytotoxicity

Euglobal-IIIa (1), a novel acylphloroglucinol-sesquiterpene derivative, and a known analogue, have been isolated from leaves of Eucalyptus robusta. The structures was elucidated by extensive spectroscopic data and by comparison with data reported in literature, while the absolute configuration of 1 was determined by the X-ray diffraction analysis. Compound 1 exhibited comparable cytotoxicity with that of cisplatin against five human cancer cell lines HL-60, SMMC-7721, A-549, MCF-7, and SW480 with IC50 values of 15.7, 15.5, 17.6, 14.3, and 21.8 μM, respectively.

Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild conditions

Development of a titanium silicalite-1(TS-1)catalyst with good crystallinity and a four-coordinate Ti framework is critical for efficient catalytic oxidation reaction under mild conditions.Herein,a size-controlled TS-1 zeolite(TS-10.1ACh(acetylcholine))was synthesized via steam-assisted crystallization by introducing acetylcholine as a crystal growth modifier in the preparation process,and TS-10.1ACh was also employed in epoxidations of different substrates containing C=C double bonds.The crystalline sizes of the as-synthesized TS-10.1ACh catalysts were controlled with the acetylcholine content,and characterization results showed that the particle sizes of highly crystalline TS-10.1ACh zeolite reached 3.0μm with a good Ti framework.Throughout the synthetic process,the growth rate of the crystals was accelerated by electrostatic interactions between the connected hydroxyl groups of the acetylcholine modifier and the negatively charged skeleton of the pre-zeolites.Furthermore,the TS-10.1ACh catalyst demonstrated maximum catalytic activity,good selectivity and high stability during epoxidation of allyl chloride.Importantly,the TS-10.1ACh catalyst was also highly versatile and effective with different unsaturated substrates.These findings may provide novel,easily separable and large TS-1 catalysts for efficient and clean industrial epoxidations of C=C double bonds.

定量核磁共振氢谱法对徐长卿中丹皮酚含量的快速提取和含量测定

徐长卿是一种治疗多种疾病的中药材。丹皮酚是徐长卿的主要活性成分,也是质量控制的关键指标物。本文以核磁共振氢谱建立了一种徐长卿中丹皮酚含量的快速、准确、精密的检测方法。结果表明,氘代甲醇作溶剂可以很好的实现核磁共振氢谱中信号的分离,H-6 (δ7.78)可用作定量分析特征信号,均苯三甲酸用作内标。所建立的方法经线性范围、专属性、重复性和稳定性进行了确证。本文首次采用定量核磁共振氢谱检测徐长卿中丹皮酚的含量,线性范围较其他药材中丹皮酚的含量检测更宽。采用单次提取方式对丹皮酚进行提取,方法快速,更利于应用于质量控制中。本文研究表明相对现有基于高效液相色谱检测方法,定量核磁共振氢谱法是一种适合徐长卿质量控制可行的替代方法。