Inhibitors of alkaline phosphatase of Sarcoma 180/TG

(S)-(-)-6-(4-Bromo-phen-yl)-2,3,5,6-tetra-hydro-thia-zolo[2,3-b]imidazolium hydrogen oxalate

The structure of the title compound, C(11)H(12)BrN(2)S(+)·C(2)HO(4) (-) (common name 6-bromo-levamisole hydrogen oxalate), is stabilized mainly by hydrogen bonds. Hydrogen oxalate anions form parallel coplanar chains via O-H⋯O hydrogen bonds, while there are N-H⋯O hydrogen-bonding inter-actions between the 6-bromo-levamisole cations and oxalate anions. Both five-membered rings from the 6-bromo-levamisole mol-ecule have a twist conformation. The mol-ecule has an extended conformation, with the 4-bromo-phenyl substituent positioned equatorially with N-C-C-C and C-C-C-C torsion angles of 39.8 (3) and 100.4 (3)°, respectively.

Synthesis and biological investigations of some 5H-1,3,4-oxadiazolo[3,2-a]pyrimidin-5-ones

The synthesis of some substituted 7-hydroxy-5H-1,3,4-oxadiazolo [3,2-a]pyrimidin-5-ones, a class of bicyclics with unexplored pharmacotoxicological properties, is described. Reacting the 2-phenyl derivative with bis(2,4,5-trichlorophenyl)benzylmalonate afforded a linear pyrano-oxadiazolopyrimidinedione. The assigned structures were verified by IR, 1H-NMR, and mass spectral studies. Six compounds of the series were screened for in vitro antibacterial and antifungal activities. The effect of four compounds on alkaline phosphatase enzyme was also examined.