Abstract: Novel 2-(3-(4-substituted aryl)guanidine-1-yl)-4-phenyl-6-(thiophene-2-yl)pyrimidines (7) were synthesized by simple condensation between chalcones with therapeutic biguanide derivatives. The novel guanidinopyrimidine derivatives (7) were characterized by different spectral studies. Furthermore, subject to ADMET prediction using pkSCM software and molecular docking studies against different kinds of novel RNA proteins such as, spike (PDB ID: 6XC3), main protease (3CLpro - PDB ID: 6LU7), RNA-dependent RNA polymerase (RdRp – PDB ID: 6W9Q) and host protein ACE2 (PDB ID:1R42) spike protein and also the activities are compared with FDA-approved few human trial drugs such as hydroxychloroquine (HQC), favipiravir and lopinavir.