First Gewald reaction ignited by sodium polysulfide: greener ultrasound-promoted synthesis of substituted 2-aminothiophenes in the absence of catalyst

2013 ◽  
Vol 34 (5) ◽  
pp. 458-463 ◽  
Author(s):  
Chengyuan Liang ◽  
Dong Lei ◽  
Xiuzhen Wang ◽  
Qingqing Zhang ◽  
Qizheng Yao
Keyword(s):  
Gewald Reaction ◽  
Sodium Polysulfide

scholarly journals Characterization and biological evaluation of some novel pyrazolo[3',4':4,5]thieno[2,3-d]pyrimidin-8-ones synthesized via the Gewald reaction

2008 ◽  
Vol 73 (7) ◽  
pp. 683-690 ◽  
Author(s):  
Dipti Dodiya ◽  
Amit Trivedi ◽  
Samir Jarsania ◽  
Shailesh Vaghasia ◽  
Viresh Shah
Keyword(s):  
Antimicrobial Activity ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Spectroscopic Investigation ◽  
Aromatic Aldehydes ◽  
Biological Evaluation ◽  
Bacterial Strains ◽  
Gewald Reaction ◽  
Compound Ii

The synthesis of substituted pyrazolo[3',4':4,5]thieno[2,3-d]pyrimidin-8-ones (IIIa-j) from 5-amino-3-methyl-1H-thieno[3,2-c]pyrazole-6-carbonitrile (II) is described. The key compound II was synthesized from (5-methyl- -2,4-dihydro-3H-pyrazol-3-ylidene)malononitrile I via the Gewald reaction. The synthesis of the title compounds IIIa-j was accomplished by condensation of II with different aromatic aldehydes. The newly synthesized heterocyles were characterized by elemental analysis, IR, 1H-NMR, 13C-NMR and mass spectroscopic investigation. All the newly synthesized compounds were evaluated for antimicrobial activity against a variety of bacterial strains. .

Synthesis of Thiophene Derivatives on Soluble Polymer-Support Using Gewald Reaction

Synthesis ◽  
2004 ◽  
pp. 3055-3059 ◽  
Author(s):  
Guichun Yang ◽  
Haiqing Zhang ◽  
Jianian Chen ◽  
Zuxing Chen
Keyword(s):  
Polymer Support ◽  
Soluble Polymer ◽  
Gewald Reaction ◽  
Thiophene Derivatives

Activation of Elemental Sulfur by Electrogenerated Cyanomethyl Anion: Synthesis of Substituted 2-Aminothiophenes by the Gewald Reaction

2008 ◽  
Vol 350 (17) ◽  
pp. 2740-2746 ◽  
Author(s):  
Marta Feroci ◽  
Isabella Chiarotto ◽  
Leucio Rossi ◽  
Achille Inesi
Keyword(s):  
Elemental Sulfur ◽  
Gewald Reaction

Exploring the scope of the Gewald reaction: Expansion to a four-component process

2017 ◽  
Vol 58 (14) ◽  
pp. 1408-1412 ◽  
Author(s):  
M. Saeed Abaee ◽  
Atefeh Hadizadeh ◽  
Mohammad M. Mojtahedi ◽  
Mohammad R. Halvagar
Keyword(s):  
Component Process ◽  
Gewald Reaction

Synthesis and Characterization of New 2-Methoxy-Thieno[2,3-d]pyrimidin-4(3H)-One

2012 ◽  
Vol 550-553 ◽  
pp. 89-92
Author(s):  
Lian Ying Lu ◽  
Zhong Shan Yu ◽  
Zheng Dong Fang ◽  
Yong Zhou Chen ◽  
Wen Zhou ◽  
...  
Keyword(s):  
1H Nmr ◽  
Efficient Method ◽  
Nmr Spectra ◽  
Wittig Reaction ◽  
Nucleophilic Reagent ◽  
1H Nmr Spectra ◽  
Synthesis And Characterization ◽  
Cyclization Process ◽  
Gewald Reaction

An efficient method is described for the synthesis of 2-methoxy-thieno[2,3-d]pyrimidin- 4(3H)-one (5) via Gewald reaction, a tandem aza-Wittig reaction and cyclization process. The key step is an aza-Wittig reaction between iminophosphorane (2), 4-chlorophenyl isocyanine and nucleophilic reagent CH3OH. Its structures were determined by means of MS, IR and 1H NMR spectra.

ChemInform Abstract: Synthesis of 4-Isobutyl Substituted Thiophenes by Gewald Reaction.

ChemInform ◽  
2010 ◽  
Vol 27 (27) ◽  
pp. no-no
Author(s):  
M. GUETSCHOW ◽  
H. SCHROETER ◽  
G. KUHNLE ◽  
K. EGER
Keyword(s):  
Gewald Reaction
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