A superparamagnetic graphene oxide (GO)/Fe3O4–CuBr catalyst was prepared via a simple chemical method and characterized by Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The GO/Fe3O4–CuBr catalyst could be dispersed homogeneously in water and further used as an excellent semi-heterogeneous catalyst for the one-pot multi-component Cu(I)-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC) reaction. 1,4-Disubstituted mono/bis-1,2,3-triazoles are readily obtained on a multi-gram scale by the reaction of aryl/alkyl halides, alkynes and sodium azide under microwave irradiation conditions in good to excellent yields. Moreover, GO/Fe3O4–CuBr could be separated conveniently from the reaction mixtures by an external permanent magnet and reused in at least six consecutive runs without a noticeable drop in the product yield and its catalytic activity.
通过简单的化学方法合成了一种超顺磁性的氧化石墨烯 (GO)/Fe3O4–CuBr 催化剂,并通过傅里叶变换红外光谱 (FTIR)、热重分析 (TGA)、透射电子显微镜 (TEM)、粉末 X 射线衍射 (XRD) 和 X 射线光电子能谱 (XPS) 进行了表征。GO/Fe3O4–CuBr 催化剂可以在水中均匀分散,进一步作为一种优良的半均相催化剂,用于一锅法多组分 Cu(I) 催化的叠氮-炔烃 1,3-偶极环加成反应(CuAAC)。在微波辐射条件下,通过芳基/烷基卤化物、炔烃和叠氮化钠的反应,能以良好到优秀的产率在多克规模上迅速获得 1,4-二取代的单/双-1,2,3-三唑。此外,GO/Fe3O4–CuBr 可以通过外部永久磁铁方便地从反应混合物中分离,并在至少六个连续反应中重复使用,且产品产率和催化活性没有明显下降。
Design, synthesis and molecular docking studies of thymol based 1,2,3-triazole hybrids as thymidylate synthase inhibitors and apoptosis inducers against breast cancer cells
作者:Mohammad Mahboob Alam、Azizah M. Malebari、Nazreen Syed、Thikryat Neamatallah、Abdulraheem S.A. Almalki、Ahmed A. Elhenawy、Rami J. Obaid、Meshari A. Alsharif
DOI:10.1016/j.bmc.2021.116136
日期:2021.5
thymidylate synthase enzyme with 2.4 and 1.26 fold activity to standard drug, Pemetrexed (IC50 5.39 μM) suggesting their mode of action as thymidylate synthase inhibitors. Cell cycle arrest and annexin V induced apoptosis study of compound 10 showed cell cycle arrest at the G2/M phase and induction of apoptosis in MCF-7 cells. The molecular docking was accomplished onto thymidylate synthase (TS) protein
Thymol as an Interesting Building Block for Promising Fungicides against <i>Fusarium solani</i>
作者:Mariana Alves Eloy、Rayssa Ribeiro、Leandra Martins Meireles、Thiago Antonio de Sousa Cutrim、Carla Santana Francisco、Clara Lirian Javarini、Warley de Souza Borges、Adilson Vidal Costa、Vagner Tebaldi de Queiroz、Rodrigo Scherer、Valdemar Lacerda、Pedro Alves Bezerra Morais
DOI:10.1021/acs.jafc.0c07439
日期:2021.6.30
were elucidated by 1H and 13C NMR, IR, and HRMS data. These derivatives were evaluated in vitro for their fungicidal activity against Fusarium solani sp. Among the nine triazolic thymol derivatives obtained, seven of them were found to have moderated antifungal activity. In contrast, naphthoquinone/thymol hybrid ether 2b displayed activity comparable with that of the commercial fungicide thiabendazole
通过威廉姆森合成和铜催化叠氮化物-炔环加成 (CuAAC) 方法实现了 15 种新百里酚衍生物的半合成。CuAAC 使用“点击化学”策略,在炔基百里酚衍生物和商业或制备的叠氮化物存在下的反应,在微波辐射下提供了九种百里酚衍生物。该程序减少了反应时间和成本。通过1 H 和13 C NMR、IR 和 HRMS 数据阐明了所有分子实体。体外评估了这些衍生物对茄病镰刀菌的杀真菌活性sp. 在获得的九种三唑百里酚衍生物中,发现其中七种具有适度的抗真菌活性。相比之下,萘醌/百里酚杂化醚2b显示出与商业杀菌剂噻苯达唑相当的活性。讨论了最活跃的化合物2b的构效关系,并通过可能与真菌麦角甾醇结合和干扰 K +渗透平衡进入细胞外介质来预测作用模式。
Raney Ni catalyzed azide-alkyne cycloaddition reaction
作者:H. Surya Prakash Rao、Guravaiah Chakibanda
DOI:10.1039/c4ra07057g
日期:——
Raney Ni efficiently catalyzes acetylene azide cycloaddition reactions to form 1,2,3-triazoles.
Raney镍有效地催化乙炔叠氮环加成反应,形成1,2,3-三唑。
Rh(I)‐Catalyzed Decarboxylative Arylation of Alkynyl Cyclic Carbonates: Divergent Access to Substituted
<i>α</i>
‐Allenols and 1,3‐Butadienes
作者:Geetanjali S. Sontakke、Rahul K. Shukla、Chandra M. R. Volla
DOI:10.1002/adsc.202101064
日期:2022.2
Rh(I)-catalyzed decarboxylative arylation of alkynyl cyclic carbonates using commercially available and low-toxic aryl boronic acids has been disclosed. Depending on the nature of the cyclic carbonates, the methodology provides a straightforward platform to access either substituted 2,3-allenols or 1,3-butadiene derivatives. Internal alkynyl cyclic carbonates undergo monoarylation to conveniently afford