Benzothiazole derivatives as novel inhibitors of human 11β-hydroxysteroid dehydrogenase type 1

Selective inhibitors of 11 beta-hydroxysteroid dehydrogenase type 1 (11 beta-HSDl) have considerable potential as treatments for metabolic diseases, such as diabetes mellitus type 2 or obesity. Here, we report the discovery and synthesis of a series of novel benzothiazole derivatives and their inhibitory activities against 11 beta-HSDl from human hepatic microsomes measured using a radioimmunoassay (R[A) method. The benzothiazole derivatives 1 and 2 showed greater than 80% inhibition for 11 beta-HSDl at 10 mu M and exhibited IC50 values in the low micromolar range. The preliminary SAR study suggested the introduction of a chlorine substituent at the 4 position of the benzothiazole ring greatly enhanced the inhibitory activities. Docking studies with the benzothiazole derivative 1 into the crystal structure of human 11 beta-HSDl revealed how the molecule may interact with the enzyme and cofactor. (c) 2005 Elsevier Ireland Ltd. All rights reserved.