4-Amino-5-phenyl-4H-1,2,4-triazole-3-thiol (1) underwent facile condensation with various phosphorus dichlorides (2a—j) in the presence of triethylamine in dry tetrahydrofuran at 60—65 °C and afforded corresponding thiadiazaphosphol-2-ones (3a—j). Their chemical structures were characterized using IR, 1H-, 13C-, 31P-NMR and Mass spectral studies. All the title compounds were screened for antioxidant properties by radical scavenging methods such as 1,1-diphenyl-2-picryl hydrazyl (DPPH), hydroxyl and lipid peroxidation. They exhibited potent in vitro antioxidant activity dose dependently. Their bioassay showed them to possess significant antibacterial activity.
A New Synthesis of (PhPSe2)2 (Woollins Reagent) and Its Use in the Synthesis of Novel P-Se Heterocycles
作者:Ian P. Gray、Pravat Bhattacharyya、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1002/chem.200500291
日期:2005.10.21
A new and improved method for the preparation of (PhPSe2)2 (Woollins reagent (WR), 1) is reported. Reaction of dichlorophenylphosphine with Na2Se, (prepared from the reaction of elemental selenium and sodium in liquid ammonia) gives WR with excellent purity, high yield and on a larger scale than was previously possible. Four novel phosphorus-selenium heterocycles, including a spirocyclic heterocycle