Synthesis of some new 1,3/ or 1,4-bis(glucopyranosyl-1,2,4-triazol-5-ylthio)propanes/ or butanes as potential antimicrobial agents

N- and S-α-l-Arabinopyranosyl[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles. First synthesis and biological evaluation

First synthesis of N- and S-alpha-l-arabinopyranosyl[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles is described. Antimicrobial screening of two selected regioisomeric compounds against Aspergillus fumigatus, Penicillium italicum, Syncephalastrum racemosum, Candida albicans, Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus subtilis and Escherichia coli are compared.

First synthesis and antimicrobial activity Of N- and S-alpha-L-arabinopyranosyl-1,2,4-triazoles

Arabinosylation of some 4-amino- and 4-arylideneamino-5-(pyridin-3-yl)-2,4-dihydro-[1,2,4]-triazole-3-thiones with 2,3,4-tri-O-acetyl-beta-L-arabinopyranosyl bromide led to an efficient synthetic approach to the corresponding N-and S-alpha-L-arabinopyranosides. Structure assignment of these two regiosiomers was based on chemical and spectroscopic evidences. Antimicrobial activities of two selected regioisomeric N-and S-alpha-L-arabinopyranosides were compared. The N-alpha-L-arabinopyranoside showed higher inhibitory effect than its regioisomeric S-alpha-L-arabinopyranoside against Aspergillus fumigatus, Penicillium italicum, Staphylococcus aureus, and Pseudomonas aeruginosa.

Novel simple efficient synthetic approach toward 6-substituted-2H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole-3-thiones and first synthesis and biological evaluation of N-and S-beta-D-glucosides of the[1,2,4]triazolo [3,4-b][1,3,4]thiadiazole ring system

Novel simple and efficient synthetic approach for the synthesis of 6-substituted-2H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole-3-thiones is described. Glucosidation of these novel bases with 2,3,4,6-tetra-O-acetyl-alpha-D-glucopyranosyl bromide followed by chromatographic separation gave the corresponding N-and S-ss-D-glucosides. The structure of these two regiosiomers was established chemically and spectroscopically. Antimicrobial screening of two selected regioisomeric compounds against Aspergillus fumigatus, Penicillium italicum, Syncephalastrum racemosum, Candida albicans, Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus subtilis, and Escherichia coli are compared.

Efficient synthesis, structure, and antimicrobial activity of some novel N- and S-β-d-glucosides of 5-pyridin-3-yl-1,2,4-triazoles

Glucosidation of some 4-amino- and 4-arylideneamino-5-(pyridin-3-yl)-2,4-dihydro-[1,2,4]-triazole-3-thiones with 2,3,4,6-tetra-O-acetyl-alpha-D-glucopyranosyl bromide followed by chromatographic separation gave the corresponding N- and S-beta-D-glucosides. The structure of these two regiosiomers was established chemically and spectroscopically. Deamination as well as deacetylation of some selected nucleosides have been achieved. Antimicrobial screening of 14 selected compounds resulted in their activity against Aspergillus fumigatus, Penicillium italicum, Syncephalastrum racemosum, Candida albicans, Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus subtilis, and Escherichia coli.