Oxidation of thiazolo[3,2-a]pyrimidin-3(2H)-ones with DMSO and Lawesson’s reagent
摘要:
2,2'-Dimers with a central double bond were prepared by the oxidation of 5,6-disubstituted 7-methyl-5H-[1,3]thiazolo[3,2-a]pyrimidin-3(2H)-ones with DMSO and Lawesson's reagent at room temperature. The role of DMSO as an oxidizing reagent was confirmed by NMR spectroscopy. The E-configuration of the central C=C bond for the two diastereomers of compound 8m was proven by single crystal X-ray data. The dimeric thiazolopyrimidines were orange or red colored and absorption bands at 283-330 and 459-476 nm were observed in the UV spectra. (C) 2018 Elsevier Ltd. All rights reserved.
Design, synthesis and anticancer activity of new monastrol analogues bearing 1,3,4-oxadiazole moiety
作者:Fatma A.F. Ragab、Sahar M. Abou-Seri、Salah A. Abdel-Aziz、Abdallah M. Alfayomy、Mohamed Aboelmagd
DOI:10.1016/j.ejmech.2017.06.026
日期:2017.9
A series of dihydropyrimidine (DHPM) derivatives bearing 1,3,4-oxadiazole moiety was designed and synthesized as monastrol analogues. The new compounds were screened for their cytotoxic activity toward 60 cancer cell lines according to NCI (USA) protocol. Seven compounds were further examined against the most sensitive cell lines, leukemia HL-60(TB) and MOLT-4. The most active compounds were 9m against
Synthesis and Biological Activities of Novel Thiazole Derivatives of DHPMs via the N, S-dialkylation
作者:Xiao-Fei Zhu、De-Qing Shi
DOI:10.1080/10426500701841680
日期:2008.7.4
A series of novel 1-[6-aryl-1-(2-chlorothiazol-5-yl-methyl)-2-(2-chlorothiazol-5-yl -methylsulfanyl)-4-methyl-1,6-dihydropyrimidin-5-yl]carboxylates or ethanones 2 were synthesized via the N,S-dialkylation of 3,4-dihydropyrimidin-2(1H)-ones (DHPMs) 1 using 2-chloro-5-(chloromethyl)thiazole as the alkylation reagent in one-pot reaction. The structures of the target compounds were confirmed by IR, 1H
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
Efficient Catalytic Synthesis of 3,4-Dihydropyrimidin-2-ones/thiones <i>via</i>
Little Acidic Ionic Liquid Combined with Rapid Heating Ways
作者:Guo-Ping Zhang、Da-Yu Tian、Wang-Ming Shi
DOI:10.1002/jhet.3292
日期:2018.11
Catalyticsynthesis of 3,4‐dihydropyrimidin‐2(1H)‐ones/thiones was efficiently promoted by as little as 2.5 mol% of Brønsted acidicionicliquid [(CH2)3SO3HMIM]HSO4 catalyst loading viarapidheatingways. Interestingly, rapidheating effectively improved yields to avoid side products. Furthermore, the mechanism has been speculated that the reaction proceeds may be viarapidly one‐step condensation
通过快速加热负载低至2.5 mol%的布朗斯台德酸性离子液体[(CH 2)3 SO 3 HMIM] HSO 4催化剂可有效地促进3,4-二氢嘧啶-2(1 H)-酮/硫酮的催化合成方法。有趣的是,快速加热有效地提高了产量以避免副产物。此外,据推测该机理可能是通过快速的一步冷凝而不是缓慢的逐步冷凝来进行的。此外,可以回收催化剂以重复使用(最多七次),整个绿色反应过程增加了其实用性。
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。