Synthesis and Biological Activity of Thiazolidine Piperidine Nicotinamide Compounds

The structure of thiazolidine piperidine could affect the metabolic activitives of cholesterol compounds in vivo, and it is the key pharmacophore of oxythiazolidine to inhibit the oxygen cholesterol-binding protein (OSBP) of pathogenic bacteria. 14 novel thiazolidine piperidine nicotinamide derivatives were designed and synthesized in search of new bioactive compounds containing thiazolidine piperidine structure. The structures of target compounds were characterized by H-1 NMR, C-13 NMR and HRMS spectra. The preliminary bioassay showed that the target compounds generally had antibacterial activities. At the concentration of 100 mu g/mL, the antibacterial activity of one compound against Fusarium graminearum was 60%, the antibacterial activities of three compounds against Botrytis cinerea were 60%, the bacteriostatical activities of six compounds aganist Diplocarpon mali were 70%, and the antibacterial activity of (4-(5-(2,3-dichlorophenyl)-4-methylthiazol-2yl)piperidin-1-yl)(5,6-dichloropyridin-3-yl)methanone (6k) against Phytophthora infestans (Mont.) de Bary was 75%. Therefore it was worth for further research about structural optimization.