Abstract: Synthesis of [N, N′-bis (N-benzoylthiocarbamoyl)-N, N′-bis (benzyl)] ethane-1, 2- diamines 4a-h, their cyclization to [N, N′-bis (5-benzoyl-4-phenylthiazol-2-yl)-N, N′-- bisbenzyl] ethane-1, 2-diamines 5a-h by reaction with phenacyl bromide and the results of antibacterial activity assay of 4a-h and 5a-h are reported.