Mosadegh Keshavarz | University of Perugia (original) (raw)
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National Institute of Technology Rourkela
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Papers by Mosadegh Keshavarz
Journal of the Chinese Chemical Society, 2014
ABSTRACT A simple and efficient one-pot synthesis of Alkyl-2-(alkylimino)-4-methyl-3-phenyl-2,3-d... more ABSTRACT A simple and efficient one-pot synthesis of Alkyl-2-(alkylimino)-4-methyl-3-phenyl-2,3-dihydrothiazole-5-carboxylate and Dialkyl 3,3'-(1,4-phenylene)-bis-[2-(alkylimino)-4-methyl-2,3-dihydrothiazole-5-carboxylate] derivatives from the reaction of phenylisothiocyanate (and also 1,4-phenylene diisothiocyanate) and primary alkylamines in the presence of 2-chloro-1,3-dicarbonyl compounds is described. This new protocol has several advantages such as lack of necessity of the catalyst and solvent, good yields,mild conditions and short times for reaction.
Chinese Chemical Letters, 2014
A novel catalytic synthesis of 3,3'-(arylmethylene)-bis-(4-hydroxy-2H-chromene-2-one) derivatives... more A novel catalytic synthesis of 3,3'-(arylmethylene)-bis-(4-hydroxy-2H-chromene-2-one) derivatives from a tandem
condensation reaction of 4-hydroxycoumarin and aromatic aldehydes has been developed. The reaction occurs in water in the
presence of Melamine trisulfonic acid as catalyst to give the corresponding products in good to high yields. This green
approach has several advantages such as short reaction times, clean reaction profiles, and simple experimental and workup
procedures. Moreover, the catalyst can be easily recovered by filtration and used at least seven times with only slight reduction
in its catalytic activity. The results of the presented protocol in comparison with the different available catalysts in
condensation reaction of benzaldehyde with 4-Hydroxycoumarin show that MTSA presented better results due to the structure
of MTSA.
Journal of the Chinese Chemical Society, 2014
ABSTRACT A simple and efficient one-pot synthesis of Alkyl-2-(alkylimino)-4-methyl-3-phenyl-2,3-d... more ABSTRACT A simple and efficient one-pot synthesis of Alkyl-2-(alkylimino)-4-methyl-3-phenyl-2,3-dihydrothiazole-5-carboxylate and Dialkyl 3,3'-(1,4-phenylene)-bis-[2-(alkylimino)-4-methyl-2,3-dihydrothiazole-5-carboxylate] derivatives from the reaction of phenylisothiocyanate (and also 1,4-phenylene diisothiocyanate) and primary alkylamines in the presence of 2-chloro-1,3-dicarbonyl compounds is described. This new protocol has several advantages such as lack of necessity of the catalyst and solvent, good yields,mild conditions and short times for reaction.
Chinese Chemical Letters, 2014
A novel catalytic synthesis of 3,3'-(arylmethylene)-bis-(4-hydroxy-2H-chromene-2-one) derivatives... more A novel catalytic synthesis of 3,3'-(arylmethylene)-bis-(4-hydroxy-2H-chromene-2-one) derivatives from a tandem
condensation reaction of 4-hydroxycoumarin and aromatic aldehydes has been developed. The reaction occurs in water in the
presence of Melamine trisulfonic acid as catalyst to give the corresponding products in good to high yields. This green
approach has several advantages such as short reaction times, clean reaction profiles, and simple experimental and workup
procedures. Moreover, the catalyst can be easily recovered by filtration and used at least seven times with only slight reduction
in its catalytic activity. The results of the presented protocol in comparison with the different available catalysts in
condensation reaction of benzaldehyde with 4-Hydroxycoumarin show that MTSA presented better results due to the structure
of MTSA.