Microwave-based synthesis of novel thienopyrimidine bioisosteres of gefitinib

A series of novel 2-unsubstituted 4-(substituted)anilinothieno[2,3-d]pyrimidines is synthesized through the chlorination of the corresponding 2-unsubstituted-thieno[2,3-d]-pyrimidin-4-ones, followed by the nucleophilic displacement of the 4-Cl group of 9, with a variety of anilines. All four steps of this synthesis involve microwave irradiation (MWI) and the entire synthesis requires only 2 h.