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.
Tetrachlorosilane catalyzed multicomponent one-step fusion of biopertinent pyrimidine heterocycles
作者:Chennan Ramalingan、Young-Woo Kwak
DOI:10.1016/j.tet.2008.03.078
日期:2008.5
Multicomponent one-step fusion of a variety of pharmacologically pertinent pyrimidine heterocycles has efficiently been achieved from their respective aldehydes, beta-dicarbonyl compounds, and urea/thiourea in the presence of a catalytic amount of tetrachlorosilane in DMF/AN mixture at normal ambient temperature. (C) 2008 Elsevier Ltd. All rights reserved.
Oxidation of thiazolo[3,2-a]pyrimidin-3(2H)-ones with DMSO and Lawesson’s reagent
作者:Eugenia A. Lashmanova、Anastasiya I. Kirdyashkina、Pavel A. Slepukhin、Andrey K. Shiryaev
DOI:10.1016/j.tetlet.2018.02.014
日期:2018.3
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.
One-Pot Synthesis of Dihydropyrimidine-Thione Derivatives Using Tungstate Sulfuric Acid (TSA) as a Recyclable Catalyst
Abstract An efficient, simple, and environmentally benign procedure for the one-pot synthesis of 3,4-dihydropyrimidine-2-(1H) thione derivatives that entails the three-component condensation of appropriate aryl aldehydes, β-dicarbonyls, and thiourea in the presence of catalytic amount of tungstate sulfuric acid under solvent-free conditions was reported. This method has many advantages including excellent