A microwave-assisted method for the palladium-catalyzed direct arylation of quinazolin-4-one has been developed under copper-assistance. This method is applicable to a wide range of aryl iodides and substituted (2H)-quinazolin-4-ones. This protocol provides a simple and efficient way to synthesize biologically relevant 2-arylquinazolin-4-one backbones.
Convenient one-pot synthesis of N3-substituted pyrido[2,3-d]-, pyrido[3,4-d]-, pyrido[4,3-d]-pyrimidin-4(3H)-ones, and quinazolin-4(3H)-ones analogs
A convenient microwave-assisted one-pot sequential synthesis provided access to novel pyridopyrimidin-4-(3H)-ones in good to excellent yields. Anthranilic acid, 2- and 4-aminonicotinic acids, and 3-aminoisonicotinic acid were quantitatively converted into the analogous amidinoesters which undergo rapid cyclization in the presence of an amine.