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.