Novel benzazole derivatives bearing a (imidazolidin-2-yl) imino moiety at position 1 or 2 were synthesized by reacting 1-amino-or 2-aminobenzazoles with N, N′-bis (tert- butoxycarbonyl) imidazolidine-2-thione in the presence of HgCl2. Structures of 1- [(imidazolidin-2-yl) imino] indazole (marsanidine, 13a) and free base of the 4-Cl derivative 12e were confirmed by X-ray single crystal structure analysis. Compound 13a was found ...