Oxalic acid as a versatile catalyst for one pot facile synthesis of 3,4-dihydropyrimidin-2-(1<i>H</i>)-ones and their thione analogues
作者:Jaiprakash N. Sangshetti、Devanand B. Shinde、Nagnnath D. Kokare
DOI:10.1002/jhet.5570450440
日期:2008.7
3,4-Dihydropyrimidin-2-(1H)-ones and their thioneanalogues are synthesized from the condensation of aromatic aldehydes, β-dicarbonyl compound and urea or thiourea in presence of 5 mol% of oxalicacid in ethanol-water (1:2; v/v) under mild reaction conditions. The yields obtained are better and also the use of very inexpensive catalyst, environmentally benign solvent and easy work-up are the advantageous
3,4-二氢嘧啶-2-(1 H)-及其硫酮类似物是由芳香醛,β-二羰基化合物与脲或硫脲在乙醇水溶液中存在5 mol%的草酸缩合而成的(1 :2; v / v)在温和的反应条件下。获得的产率更好,并且使用非常便宜的催化剂,对环境无害的溶剂和易于后处理是本方法的有利方面。
Novel Dihydropyrimidine Derivatives And Their Use As Anti-Cancer Agents
申请人:Lopez Roman
公开号:US20080145453A1
公开(公告)日:2008-06-19
The invention concerns molecules of formula (I), drugs containing same and their use as anti-cancer agents.
本发明涉及公式(I)的分子,含有该分子的药物以及它们作为抗癌剂的使用。
Ultrasound-Mediated Synthesis of 3,4-Dihydropyrimidin-2-(<i>1H</i>)-Ones (or Thiones) with NaHSO<sub>4</sub>·H<sub>2</sub>O
A fast and efficient Biginelli synthesis of 3,4-dihydropyrimidin-2-(1H)-ones (or thiones) by the reaction of aromatic aldehydes, -dicarbonyls, and urea/thiourea using NaHSO4H2O/ultrasound system is presented. The reactions were carried out in refluxing n-hexane/CH3CN (2.5:0.5mL) to afford the products in excellent yields.
Evaluation of dihydropyrimidin-(2H)-one analogues and rhodanine derivatives as tyrosinase inhibitors
A series of dihydropyrimidin-(2H)-one analogues and rhodanine derivatives were synthesized and their inhibitory effects on the diphenolase activity of mushroom tyrosinase were evaluated. The results showed that some of the synthesized compounds exhibited significant inhibitory activities. Especially, compound 15 bearing a hydroxyethoxyl group at position-4 of phenyl ring exhibited most potent tyrosinase inhibitory activity with IC50 value of 0.56 mM. The inhibition mechanism analysis of compound 15 demonstrated that the inhibitory effect of the compound on the tyrosinase was irreversible. These results suggested that such compounds might be served as lead compounds for further designing new potential tyrosinase inhibitors. (C) 2011 Elsevier Ltd. All rights reserved.
The Efficient Synthesis of 3,4-Dihydropyrimidin-2-(1<i>H</i>)-Ones and Their Sulfur Derivatives with H<sub>2</sub>SO<sub>4</sub> Immobilized on Activated Charcoal
Various 3,4-dihydropyrimidin-2-(1H)-ones (DHPMs) and their sulfur derivatives were efficiently synthesized by a one-pot cyclocondensation reaction of aromatic and aliphatic aldehydes, beta-dicarbonyl compounds and urea (or thiourea) in the presence of sulfuric acid immobilized on activated charcoal (133% w/w). The reactions were carried out in refluxing n-hexane-acetonitrile (2.5:0.5 mL) within 5-150 min to give 3,4-dihydropyrimidinones (or thiones) in high to excellent yields (81-97%).