Computational Sciences - Research Publications

Permanent URI for this collectionhttps://kr.cup.edu.in/handle/32116/42

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Author: search.filters.author.Chepchugov, Nikolay V.

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    3-Cyano-2-azaanthracene-based ‘‘push-pull” fluorophores: A one-step preparation from 5-cyano-1,2,4-triazines and 2,3-dehydronaphthalene, generated in situ
    (Elsevier, 2016) Kopchuk, Dmitry S.; Chepchugov, Nikolay V.; Taniya, Olga S.; Khasanov, Albert F.; Giri,Kousik; Kovalev, Igor S.; Santara, Saugata; Zyryanov, Grigory V.; Majee, Adinath; Rusinov, Vladimir L.; Chupakhin, Oleg N.
    A facile one-step approach towards 3-cyano-2-azaanthracenes via the [4+2] cycloaddition reaction between 5-cyano-1,2,4-triazines and 2,3-dehydronaphthalene, generated in situ from commercially available 3-amino-2-naphthoic acid, has been reported. The influence of the 1,2,4-triazine ring sub- stituents nature on the product yield has been studied. The observed experimental results were con- firmed by DFT calculations of the HOMO-LUMO energy levels of the both cycloaddends. The photophysical properties of the products have been investigated.
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    Solvent-free synthesis of 5-(aryl/alkyl)amino-1,2,4- triazines and a-arylamino-2,2 0 -bipyridines with greener prospects
    (RSC Publishing, 2017) Kopchuk, Dmitry S.; Chepchugov, Nikolay V.; Kovalev, Igor S.; Santra, Sougata; Rahman, Matiur; Giri,Kousik; Zyryanov, Grigory V.; Majee, Adinath; Charushin, Valery N.; Chupakhin, Oleg N.
    A green and highly efficient method has been developed for the synthesis of 5-(aryl/alkyl)amino-1,2,4-triazines and α-arylamino-2,2′-bipyridines according to the principles of atom economy. It has been performed by two consecutive solvent-free reaction pathways: the ipso-substitution of a cyano-group in 5-cyano-1,2,4-triazines and the aza-Diels-Alder reaction of the resulting 5-arylamino-1,2,4-triazines with 1-morpholinocyclopentene used as a dienophile. Solvent and catalyst-free conditions, operational simplicity, the compatibility with various functional groups, nonchromatographic purification technique, and high yields are the notable advantages of this procedure. The present methodology possesses a low E-factor.