Efficient Access to New Thienobenzo-1,2,3-Triazolium Salts as Preferred Dual Cholinesterase Inhibitors.

In previous research, 1,2,3-triazolium salts showed significant biological activity as potential inhibitors of cholinesterase enzymes (ChEs), which are crucial for neurotransmission. In this research, pairs of uncharged thienobenzo-triazoles and their charged salts were prepared in order to further examine the role of the positive charge on the nitrogen of the triazole ring in interactions within the active site of the enzymes, and to compare the selectivity of 1,2,3-triazolium salts in relation to their uncharged analogs obtained by photochemical cyclization. Neutral thienobenzo-triazoles showed very good selective activity toward butyrylcholinesterase (BChE), while their salts showed excellent non-selective inhibition toward both BChE (the most active : IC 0.