A general, effective, and operationally simple approach to highly substituted benzopyrano[2,3-d]pyrimidine through the annulation of salicylaldehydes, malononitrile, and secondary amines is explained. The reaction is promoted by the Brønsted–Lowry acid, furnishing a variety of benzopyrano[2,3-d]pyrimidine derivatives in synthetically useful yields.
Having a biological property is just one of features of N-heterocycles. Another thing is to be dramatically well-designed. In other words, awe-inspiring combination of materials and the thing that really makes these materials just unique of its kind is nothing but its medical properties. That is why, majority of scientists are full of enthusiasm for synthesizing of these types of materials. ln this article, we have reported five effective methods for synthesizing quinazoline, which is a immensely important group of N-heterocycles with using copper nanocatalyst stabilized on graphene oxide functionalized by N1,N2-bis((pyridine-2-yl)methyl)benzene-1,2-diamine. Moreover, we have investigated the effects of substitutions connected to aldehydes, benzylamines and benzamides as a carbon source of quinazoline heterocyclic ring. Finally, we have assessed effects kinds of ammonium salts as a nitrogen source of quinazoline heterocyclic ring.
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