An Expeditious Route toward Pyrazine-Containing Nucleoside Analogues
摘要:
An improved and convenient methodology for the synthesis of asymmetrically substituted pyrazines starting from 3,5-dichloropyrazin-2(1H)-ones has been elaborated. Several nucleoside analogues have been synthesized containing the pyrazine core as the organic base coupled with the sugar via a triazole linkage. The beneficial effect of microwave irradiation throughout the sequence has been demonstrated.
Antimycobacterial Agents. 1. Thio Analogues of Purine
摘要:
Thio analogues of purine, pyridine, and pyrimidine were prepared based on the initial activity screening of several analogues of these heterocycles against Mycobacterium tuberculosis (Mtb). Certain 6-thio-substituted purine analogues described herein showed moderate to good inhibitory activity. In particular, two purine analogues 9-(ethylcarboxymethyl)-6-(decylthio)9H-purine (20) and 9-(ethylcarboxymethyl)-6-(dodecylthio)-9H-purine (21) exhibited MIC values of 1.56 and 0.78 mug/mL respectively against the Mtb H(37)Rv strain. N-9-Substitution apparently enhances the antimycobacterial activity in the purine series described herein.
Lewis Acid Catalysed Chemoselective Amination of Alcohols Using Heterocyclic Thiones: An Avenue to Thiotetrazole Derivatives
作者:Sudhamoyee Kataky、Pikumoni Boruah、Ashim J. Thakur
DOI:10.1002/ejoc.202300515
日期:2023.10.16
Herein, the development of a Cu(OTf)2 catalysed chemoselective amination of alcohols using heterocyclic thiones is described. Notably, the method is additive, ligand or inert atmosphere free and shows good tolerance towards variety of alcohols and thiotetrazole derivatives affording good to excellent yields of the product.
Antimycobacterial Agents. 1. Thio Analogues of Purine
作者:Ashish K. Pathak、Vibha Pathak、Lainne E. Seitz、William J. Suling、Robert C. Reynolds
DOI:10.1021/jm030389b
日期:2004.1.1
Thio analogues of purine, pyridine, and pyrimidine were prepared based on the initial activity screening of several analogues of these heterocycles against Mycobacterium tuberculosis (Mtb). Certain 6-thio-substituted purine analogues described herein showed moderate to good inhibitory activity. In particular, two purine analogues 9-(ethylcarboxymethyl)-6-(decylthio)9H-purine (20) and 9-(ethylcarboxymethyl)-6-(dodecylthio)-9H-purine (21) exhibited MIC values of 1.56 and 0.78 mug/mL respectively against the Mtb H(37)Rv strain. N-9-Substitution apparently enhances the antimycobacterial activity in the purine series described herein.
An Expeditious Route toward Pyrazine-Containing Nucleoside Analogues
作者:Sachin G. Modha、Jalpa C. Trivedi、Vaibhav P. Mehta、Denis S. Ermolat’ev、Erik V. Van der Eycken
DOI:10.1021/jo102089h
日期:2011.2.4
An improved and convenient methodology for the synthesis of asymmetrically substituted pyrazines starting from 3,5-dichloropyrazin-2(1H)-ones has been elaborated. Several nucleoside analogues have been synthesized containing the pyrazine core as the organic base coupled with the sugar via a triazole linkage. The beneficial effect of microwave irradiation throughout the sequence has been demonstrated.