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RISAn alternative approach to the synthesis of new pyrimido[5′,4′:5,6][1,4] thiazino[2,3-b]quinoxaline derivatives
سال: 2015
خلاصه:
3-[(5-bromo-2-chloro-6-methylpyrimidin-4-yl)thio]quinoxalin-2-amine. This intermediate can be transformed into the title ring systems by subsequent treatment either with secondary amines followed by intramolecular cyclisation or initial...
Synthesis of [1,2,4]triazolo[3,4-b]pteridines as a novel class of heterocyclic compounds
سال: 2015
خلاصه:
A series of pteridine derivatives have been synthesised through intramolecular cyclisation of 2,4-dichloro-6-methyl-5-nitro pyrimidine with various esters of amino acids. The subsequently reaction of pteridines with hydrazine hydrate...