moieties were determined as α‐glycosidaseinhibitors. N‐Substituted pyrimidinethione and acetophenone derivatives (A1–A5, B1–B11, and C1–C11) were good inhibitors of the α‐glycosidase enzyme, with Ki values in the range of 104.27 ± 15.75 to 1,004.25 ± 100.43 nM. Among them, compound B7 was recorded as the best inhibitor, with a Ki of 104.27 ± 15.75 nM against α‐glycosidase. In silico studies were carried
The Biginelli Reaction with an Imidazolium-Tagged Recyclable Iron Catalyst: Kinetics, Mechanism, and Antitumoral Activity
作者:Luciana M. Ramos、Bruna C. Guido、Catharine C. Nobrega、José R. Corrêa、Rafael G. Silva、Heibbe C. B. de Oliveira、Alexandre F. Gomes、Fábio C. Gozzo、Brenno A. D. Neto
DOI:10.1002/chem.201204314
日期:2013.3.25
The present work describes the synthesis, characterization, and application of a new ion‐tagged iron catalyst. The catalyst was employed in the Biginelli reaction with impressive performance. High yields have been achieved when the reaction was carried out in imidazolium‐based ionicliquids (BMI⋅PF6, BMI⋅NTf2, and BMI⋅BF4), thus showing that the ionic‐liquid effects play a role in the reaction. Moreover
Air‐stable zirconium (IV)‐salophen perfluorooctanesulfonate as a highly efficient and reusable catalyst for the synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones/thiones under solvent‐free conditions
An air‐stablecomplex of zirconium (IV)‐salophen perfluorooctanesulfonate (1) was successfully synthesized by reacting Zr (salphen)Cl2 and C8F17SO3Ag. Complex 1 was characterized and studied by different techniques (NMR, IR, HRMS, TG‐DSC, conductivity and acidity measurements), and was found to be air‐stable, water tolerant, thermally stable and strongly Lewis‐acidic. Complex 1 exhibited high catalytic
通过使Zr(salphen)Cl 2与C 8 F 17 SO 3 Ag反应成功合成了一种空气稳定的锆(IV)-salophen全氟辛烷磺酸盐(1)。配合物1通过不同的技术(NMR,IR,HRMS,TG-DSC,电导率和酸度测量)进行了表征和研究,被发现具有空气稳定性,耐水性,热稳定性和强路易斯酸性。络合物1在无溶剂条件下通过醛,1,3-二羰基化合物和脲/硫脲的Biginelli反应合成3,4-二氢嘧啶-2-(1H)-酮/硫酮具有很高的催化效率。此外,复数1可以重复使用5次,而催化效率的变化却很小。与以前报道的方法相比,该方案的重要特征是无溶剂条件,反应时间短,底物相容性广,效率高和可重复使用性好。
A Novel Synthesis and Characterization of 1,2,3,4-Tetrahydropyrimidin-2(1H)-thiones
We reported the use of Brønsted acid methane sulfonic acid as a promoter for three component Biginelli cyclocondensation reaction of aryl aldehydes, acetylacetone and thiourea at 120 °C to afford the corresponding to 1,2,3,4-tetrahydropyrimidin-2(1H)-thiones in good to excellent yields in short span of time. Reaction is efficient, facile and rapid. The structural elucidation of products was done by NMR, IR and elemental analysis.
Synthesis of 4,5-disubstituted-2-thioxo-1,2,3,4-tetrahydropyrimidines and investigation of their acetylcholinesterase, butyrylcholinesterase, carbonic anhydrase I/II inhibitory and antioxidant activities
作者:Emin Garibov、Parham Taslimi、Afsun Sujayev、Zeynebe Bingol、Songul Çetinkaya、İlhami Gulçin、Sukru Beydemir、Vagif Farzaliyev、Saleh H. Alwasel、Claudiu T. Supuran
DOI:10.1080/14756366.2016.1198901
日期:2016.11.3
respectively. hCA I and II were effectively inhibited by these compounds, with Ki values in the range of 47.40-76.06 nM for hCA I, and of 30.63-76.06 nM for hCA II, respectively. The antioxidant activity of the cyclic thioureas was investigated by using different in vitro antioxidant assays, including 1,1-diphenyl-2-picrylhydrazyl (DPPH·) radical scavenging, Cu2+ and Fe3+ reducing, and Fe2+ chelating activities