catalyzed solvent-free synthesis for new heterocyclic compounds is described. A series of heterocyclic compounds can be readily obtained using the three-component reaction of diketones, aldehydes and 2-amino benzothiazole, urea or thiourea. The mechanism of the three component kaolin catalyzed Biginelli (using urea and thiourea) and Biginelli like (using 2-amino benzothiazole) reaction has been investigated
描述了用于新的杂环化合物的高岭土催化的无溶剂合成。使用二酮,醛和三酮的三组分反应可以轻松获得一系列杂环化合物2-氨基苯并噻唑, 尿素 或者 硫脲。三组分高岭土催化Biginelli的机理(使用尿素 和 硫脲)和Biginelli喜欢(使用 2-氨基苯并噻唑)反应已被调查。这是我们首次使用1 H NMR,13 C NMR和ESI-质谱表征来分离和表征关键中间体。机理研究强烈建议使用亚胺3和Knoevenagel型中间体4作为关键中间体。该反应简单,清洁并且在数分钟内获得了良好的产率。
Forlani, Luciano; Sintoni, Marina; Todesco, Paolo E., Gazzetta Chimica Italiana, 1986, vol. 116, # 5, p. 229 - 232
作者:Forlani, Luciano、Sintoni, Marina、Todesco, Paolo E.
DOI:——
日期:——
Synthesis and evaluation of antimicrobial activity of 4H-pyrimido[2,1-b]benzothiazole, pyrazole and benzylidene derivatives of curcumin
作者:Pramod K. Sahu、Praveen K. Sahu、S.K. Gupta、D. Thavaselvam、D.D. Agarwal
DOI:10.1016/j.ejmech.2012.05.020
日期:2012.8
A novel, one-pot, simple, efficient procedure for 4H-pyrimido[2,1-b]benzothiazole (4a-h), pyrazole (6a-d) and benzylidene (7a-d) derivatives of curcumin under solvent and solvent free conditions in microwave with good yield is have been synthesized. The synthesized compounds were evaluated for their antibacterial activity against gram-positive and gram-negative bacteria viz. Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella typhi, Escherichia coli, Bacillus cereus and Providencia rettgeri and antifungal activity against fungi viz Aspergillus niger, Aspergillus fumigates, Aspergillus flavus. Detailed mechanistic study shows reaction proceeds through Knoevenagel type intermediate 3a which has been suggested as key intermediate for reaction (Fig. 3). (C) 2012 Elsevier Masson SAS. All rights reserved.
FORLANI L.; SINTONI M.; TODESCO P. E., GAZZ. CHIM. ITAL., 116,(1986) N 5, 229-232