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Chapter 4 Synthesis of highly substituted pyrazolopyrimidine Figure-20 Sayed A. Ahmed et al. 36 have synthesized pyrazolo[1,5-a]pyrimidines from the appropriate 3-aminopyrazoles with the appropriate sodium (3-oxocycloalkylidene) methenolate, β-diketone, β-keto esters or 1,2-disubstitutedacrylonitrile (Figure-21). Department of Chemistry, <strong>Saurashtra</strong> university, Rajkot-360005 130
Chapter 4 Synthesis of highly substituted pyrazolopyrimidine Figure-21 Mohamed R. Shaaban et al. 37 have described a simple, facile, efficient and one pot three-component procedure for the synthesis of pyrazolo[1,5-a]pyrimidine ring systems incorporating phenylsulfonyl moiety was developed via the reaction of 1- aryl-2-(phenylsulfonyl)ethanone derivatives with the appropriate heterocyclic amine and triethylorthoformate (Figure-22). Figure-22 Baseer M. Shaikh et al. 38 has prepared pyrazolo [1, 5-a] pyrimidines derivative by the condensation of substituted of α, β- unsaturated carbonyl compounds (chalcones) with substituted 5-aminopyrazole as an alternative polyethylene glycol (PEG-400) as green reaction medium (Figure-23). Figure-23 Department of Chemistry, <strong>Saurashtra</strong> university, Rajkot-360005 131
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Saurashtra University Re - Accredit
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Statement under O.Ph.D.7 of Saurash
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I am thankful to FIST/DST and SAP/U
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Chapter 4 Synthesis and Characteriz
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Chapter - 1 Palladium Catalyzed Syn
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Chapter 1 Synthesis of functionaliz
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Chapter - 2 Synthesis and Biologica
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Chapter 2 Synthesis of substituted
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Chapter 6 Synthesis of benzodiazepi
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pyrazole derivative were faster and
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Conferences participated 1. “15 t
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