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  Indian J Med Microbiol
 

Figure 63: Chemical structures of different quinazoline derivatives. R1 = alkyl, haloalkyl, aminoalkyl, alkenyl, alkynyl, araalkynyl, heteroaralkyl, cyanoalkyl, azidoalkyl, alkoxyalkyl; R5 and R6 = hydrogen, halogen, haloalkyl, heterocyclic, heteroaryl, nitro, cyano, amino, thiol, carboxy, carbonylamido, thioalkoxy; R6 and R7 taken together to form a five or six membered carboxylic or heterocyclic rings; R8 = optionally substituted lower alkyl. X = O or S; Y = aryl or heteroaryl; n=z = 0 or 1.

Figure 63: Chemical structures of different quinazoline derivatives. R<sub>1</sub> = alkyl, haloalkyl, aminoalkyl, alkenyl, alkynyl, araalkynyl, heteroaralkyl, cyanoalkyl, azidoalkyl, alkoxyalkyl; R<sub>5</sub> and R<sub>6</sub> = hydrogen, halogen, haloalkyl, heterocyclic, heteroaryl, nitro, cyano, amino, thiol, carboxy, carbonylamido, thioalkoxy; R<sub>6</sub> and R<sub>7</sub> taken together to form a five or six membered carboxylic or heterocyclic rings; R<sub>8</sub> = optionally substituted lower alkyl. X = O or S; Y = aryl or heteroaryl; <i>n</i> <i>=</i> <i>z</i> = 0 or 1.