“…Thieno [2,3-d]pyrimidines, bicyclic systems with three heteroatoms, comprise a thiophene ring fused with the pyrimidine moiety [1]. The thieno [2,3-d]pyrimidine skeleton an important class of bioactive heterocycles, which has shown broad pharmaceutical and biological activities such as anti-in ammatory (A) [2], antibacterial (B) [3][4][5], antimicrobial (C) [6], anticancer (D) [7][8][9], antimalarial (E) [10], anti-leukemic (F) [11], anti-tumor (G) [12,13], antioxidant (H) [14], and antiviral agents (I) (Fig. 1) [15].…”