Substituted pteridinones as p90 ribosomal S6 protein kinase (RSK) inhibitors: A structure-activity study
作者:Kimberly A. Casalvieri、Christopher J. Matheson、Donald S. Backos、Philip Reigan
DOI:10.1016/j.bmc.2019.115303
日期:2020.3
evaluate the structural features of BI-D1870 that are required for RSK2 inhibition. We have identified inhibitors of RSK2 activity, evaluated their target engagement in cells, and measured their effect on cell viability and cytotoxicity in the MOLM-13 acutemyeloidleukemia (AML) cell line. The results of our studies support that RSK2 inhibition can be achieved in MOLM-13 cells without potent cytotoxicity
Recombinant silicateins as model biocatalysts in organosiloxane chemistry
作者:S. Yasin Tabatabaei Dakhili、Stephanie A. Caslin、Abayomi S. Faponle、Peter Quayle、Sam P. de Visser、Lu Shin Wong
DOI:10.1073/pnas.1613320114
日期:2017.7.3
with a range of model organosilanols and silyl ethers. The enzymes’ kinetic parameters were obtained by a high-throughput colorimetric assay based on the hydrolysis of 4-nitrophenyl silyl ethers. These assays showed unambiguous catalysis with kcat/Km values on the order of 2–50 min−1 μM−1. Condensation reactions were also demonstrated by the generation of silyl ethers from their corresponding silanols
天然海绵中的硅酸盐酶家族(门孔植物)在催化无机二氧化硅结构的形成方面具有独特的性质,该有机二氧化硅可被有机体整合到其骨架中。但是,到目前为止,仍未充分探索由这些酶催化的有机硅氧烷的合成。为了研究这些酶与这一重要类化合物的反应性,使用一系列模型有机硅烷醇和甲硅烷基醚研究了它们对Si–O键水解和缩合的催化作用。通过基于4-硝基苯基甲硅烷基醚的水解的高通量比色测定法获得了酶的动力学参数。这些测定显示出明确的催化作用,k cat / K m值约为2–50分钟-1 μM -1。缩合反应还通过由其相应的硅烷醇和醇生成甲硅烷基醚来证明。值得注意的是,当与同时带有脂肪族和芳香族羟基的底物一起出现时,与非酶甲硅烷基化形成鲜明对比的是,该酶优先使后者基团甲硅烷基化。此外,硅酸酯类能够催化转醚化,其中来自一种甲硅烷基醚的甲硅烷基可以转移到受体醇上。尽管与蛋白酶组织蛋白酶L具有紧密的序列同源性,但是当针对相似的底
Efficient and Selective Protection of Alcohols and Phenols with Triisopropylsilyl Chloride/Imidazole Using Microwave Irradiation
A very simple and efficient method is described for silylation of alcohols and phenols using triisopropylsilyl chloride and imidazole under microwave irradiation. High selectivity was observed for silylation of primary and secondary alcohols and also for structurally different phenols.
Di-<i>tert</i>-butylisobutylsilyl, Another Useful Protecting Group
作者:Huan Liang、Lin Hu、E. J. Corey
DOI:10.1021/ol201640y
日期:2011.8.5
The di-tert-butylisobutylsilyl (BIBS) protectinggroup offers new possibilities for synthetic processes because of its steric bulk, robustness of its derivatives, and other special properties.
Reductive Arylation of Nitroarenes with Chloroarenes: Reducing Conditions Enable New Reactivity from Palladium Catalysts
作者:Brett D. Akana-Schneider、Daniel J. Weix
DOI:10.1021/jacs.3c04647
日期:2023.7.26
N-arylation proceeds via a novel association-reductive palladation sequence followed by reductive elimination to yield an intermediate 1,1,2-triarylhydrazine. Arylation of this intermediate by the same catalyst via a traditional amine arylation sequence forms a transient tetraarylhydrazine, unlocking reductive N–N bond cleavage to liberate the desired product. The resulting reaction allows for the synthesis