A series of 4-amino-1-alkyl pyridinium bromide salts (1-10) were synthesized and antimicrobial activity was evaluated by disc diffusion as well as broth macro-dilution method. 4-Amino-1-hexadecylpyridinium bromide (10) which showed good inhibition against Candida albicans and C. glabrata also displayed good germ tube inhibition against C. albicans. Compound 8 shows very low haemolytic activity against human red blood cells. Compound 10 exhibits excellent antibacterial activity against Escherichia coli and Staphylococcus aureus. Inhibition of phospholipase enzyme secretion was also observed against compound 8 to find the possible mode of action.
Anomeric alkylations and acylations of unprotected mono- and disaccharides mediated by pyridoneimine in aqueous solutions
作者:Kalyan Dey、Narayanaswamy Jayaraman
DOI:10.1039/d1cc07056h
日期:——
A site-specific deprotonation followed by alkylations and acylations of sugar hemiacetals to the corresponding alkyl glycosides and acylated sugars in aqueoussolutions is disclosed herein. Pyridoneimine as a new base is developed to mediate the deprotonation of readily available sugar hemiacetals and further reactions with alkylation and acylation agents.