library of bis-sulfonamides (9–26) were synthesized and tested for their aromatase inhibitory activities. Interestingly, all bis-sulfonamide derivatives inhibited the aromatase with IC50 range of 0.05–11.6 μM except for compound 23. The analogs 15 and 16 bearing hydrophobic chloro and bromo groups exhibited the potent aromatase inhibitory activity in sub-micromolar IC50 values (i.e., 50 and 60 nM, respectively)
recognition is influenced further by the lipophilicity of a receptor during the ion transport process. Anion binding and transport activity of a bis(sulfonamide) system are far superior compared to corresponding bis(carboxylic amide) derivative. Fluorescent-based assays confirm the Cl-/anion antiport as the operational mechanism of the ion transport by bis(sulfonamides). The disruption of the ionic homeostasis
由于抗癌疗法的最新进展,跨膜阴离子运输方式正受到人们的关注。在这里,我们显示了双(磺酰胺)作为选择性Cl-离子结合和跨脂质双层膜转运的有效受体。通过1 H NMR进行的阴离子结合研究表明,磺酰胺NH质子的酸度与结合强度之间存在逻辑相关性。在离子传输过程中,受体的亲脂性进一步影响这种识别。与相应的双(羧酸酰胺)衍生物相比,双(磺酰胺)系统的阴离子结合和运输活性要优越得多。基于荧光的测定证实了Cl- /阴离子的反转运是双(磺酰胺)离子迁移的作用机理。经由双(磺酰胺)的运输的Cl-离子破坏了离子稳态。被发现强加细胞死亡。通过监测线粒体膜电位的变化,细胞色素c泄漏,胱天蛋白酶家族的激活和核碎裂研究,证实了胱天蛋白酶依赖的内在凋亡途径的诱导。
Cationic polycyclization of ynamides: building up molecular complexity
Polycyclization reactions are among the most efficient synthetic tools for the synthesis of complex, polycyclic molecules in a single operation from simple starting materials. We report in this manuscript a full account on the discovery and development of a novel cationic polycyclization from readily available ynamides. Simple activation of these building blocks under acidic conditions enables the
Isolation of Key Organometallic Aryl-Co(III) Intermediates in Cobalt-Catalyzed C(sp<sup>2</sup>)–H Functionalizations and New Insights into Alkyne Annulation Reaction Mechanisms
作者:Oriol Planas、Christopher J. Whiteoak、Vlad Martin-Diaconescu、Ilaria Gamba、Josep M. Luis、Teodor Parella、Anna Company、Xavi Ribas
DOI:10.1021/jacs.6b08593
日期:2016.11.2
for intermediates, although an organometallic Co(III) species is generally implicated. Herein, we describe a rare example of the preparation and characterization of benchtop-stable organometallic aryl-Co(III) compounds (NMR, HRMS, XAS, and XRD) prepared through a C(sp2)-H activation, using a model macrocyclic arene substrate. Furthermore, we provide crystallographic evidence of an organometallic aryl-Co(III)