On water: catalyst-free chemoselective synthesis of highly functionalized tetrahydroquinazolines from 2-aminophenylacrylate
作者:Rakesh K. Saunthwal、Monika Patel、Rakesh K. Tiwari、Keykavous Parang、Akhilesh K. Verma
DOI:10.1039/c4gc02154a
日期:——
A green and catalyst free atom-ecomonic straightforward tandem approach for the synthesis of highlyfunctionalized tetrahydroquinazolines by the reaction of 2-aminophenylacrylate 1 with isothiocyanates 2 using water as an environmental friendly solvent is described.
Metal free synthesis of substituted 5-aryl/alkyl aminotetrazoles in water
作者:Venkata Hema Kumar、Sannapaneni Janardan、Ramana Tamminana
DOI:10.1016/j.tetlet.2023.154599
日期:2023.7
The synthesis of tetrazoles is established under metal free conditions at room temperature in the presence of open air. The reaction of 2-bromoaryl isothiocyantes with amines gives thiourea that undergoes reaction in situ with NaN3 using Iodine in the presence of water medium to afford 1-(2-bromophenyl)-N-5-arylaminotetrazoles via substitution followed by electrocyclization processes at ambient temperature
四唑的合成是在室温、露天存在的无金属条件下进行的。2-溴芳基异硫氰酸酯与胺反应生成硫脲,硫脲在水介质存在下使用碘与 NaN 3 进行原位反应,通过取代得到1- (2-溴苯基)-N -5-芳基氨基四唑,然后在环境温度下进行电环化过程温度。所有给电子和吸电子取代基都很容易发生反应,得到相应的最终产物2a–2ab产量中等至良好。该方法也适用于克级数量的四唑。此外,我们的水性胶束介质表现出良好的可回收活性,并且在最多四个循环中表现出良好的产品收率。
Copper(I)-Catalyzed Synthesis of Substituted 2-Mercapto Benzimidazoles
作者:Siva Murru、Bhisma K. Patel、Jean Le Bras、Jacques Muzart
DOI:10.1021/jo802589d
日期:2009.3.6
An efficient method for the preparation of various substituted 2-mercapto benzimidazoles from their corresponding thioureas has been developed. S-Alkylation of thioureas followed by Cu-catalyzed intramolecular N-arylation furnished substituted 2-mercapto benzimidazoles in high yields and short reaction times. Furthermore, 2-mercapto benzimidazoles substituted with a p-methoxybenzyl group allowed access to benzimidazole thiones.
Two-component initiator system (amine-free) with very good storage stability and particular suitability for acid systems
申请人:Utterodt Andreas
公开号:US20070040151A1
公开(公告)日:2007-02-22
A two-component initiator system having accelerators for curing polymerizable materials comprising the following components: (a) a hydroperoxide compound containing one or more hydroperoxide groups that are bound to a tertiary carbon; (b) a thiourea derivative; and (c) as accelerator, a copper compound which is soluble in the preparation is preferably free of amine and is particularly suited for polymerizable dental compositions.