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Letters in Organic Chemistry

Author(s): Monaem Balti, Khaireddine Dridi and Mohamed Lotfi El Efrit

DOI: 10.2174/1570178611310020009

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A Simple Access in One Step to Some New Substituted Pyrazolo- and [1,2,4]triazolo-[1,5-a]pyrimidines

Page: [118 - 120] Pages: 3

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Abstract

A convenient method was established for the synthesis of some new 6,7-dihydro-2-(methylthio)-5- aminopyrazolo[1,5-a]pyrimidine-3-carbonitriles 4 and -[1,2,4]triazolo[1,5-a]pyrimidin-5-amines 5 from β- cyanohydrazines 3 and suitable ketene dithioketals 2-[bis(methylthio)methylene]propanedinitrile 1 and dimethyl Ncyanocarbonimidodithioate 2, respectively in good yields. The structure of the title compound was characterized by IR, EA, 1H- and 13C-NMR.

Keywords: β-cyanohydrazines, ketene dithioketals, pyrazolopyrimidines, triazolopyrimidines