Toward potent α-glucosidase inhibitors based on xanthones: A closer look into the structure–activity correlations
摘要:
A series of novel xanthone derivatives 6-16 having non-coplanar and flexible structures were synthesized as potent alpha-glucosidase inhibitors. Biological evaluation indicated that compounds 6-12 bearing one or two naphthol moieties exhibited up to 30-fold enhanced activities compared with their corresponding parent compounds 2-5, whereas compounds 13-16 bearing one dihydroxylnaphthalenyl group showed decreased activities compared with their corresponding analogs 6-9 having one naphthol group. Among them, compounds 7-8, 10-12 and 15 were more active than 1-deoxynojirimycin, a well-known inhibitor for alpha-glucosidase. The structure-activity correlations suggested that inhibiting of alpha-glucosidase was a result of multiple interactions with the enzyme, including pi-stacking, hydrophobic effect and conformational flexibility due to the structural non-coplanarity. In addition, compounds 4, 8 and 15 showed non-competitive inhibition. (C) 2011 Elsevier Masson SAS. All rights reserved.
A series of novel xanthone derivatives 6-16 having non-coplanar and flexible structures were synthesized as potent alpha-glucosidase inhibitors. Biological evaluation indicated that compounds 6-12 bearing one or two naphthol moieties exhibited up to 30-fold enhanced activities compared with their corresponding parent compounds 2-5, whereas compounds 13-16 bearing one dihydroxylnaphthalenyl group showed decreased activities compared with their corresponding analogs 6-9 having one naphthol group. Among them, compounds 7-8, 10-12 and 15 were more active than 1-deoxynojirimycin, a well-known inhibitor for alpha-glucosidase. The structure-activity correlations suggested that inhibiting of alpha-glucosidase was a result of multiple interactions with the enzyme, including pi-stacking, hydrophobic effect and conformational flexibility due to the structural non-coplanarity. In addition, compounds 4, 8 and 15 showed non-competitive inhibition. (C) 2011 Elsevier Masson SAS. All rights reserved.