Synthesis and antimicrobial activities of some novel bis-pyrazole derivatives containing a hydrophosphoryl unit

Vilsmeier-Haack reaction conditions were applied on some methyl ketone aryl phosphonicdihydrazones to yield some interesting bis-pyrazole derivatives containing a hydro-phosphoryl unit. Bis-{4-formyl-3-aryl-1H-pyrazol-1-yl}phosphine oxides (4a,b) were condensed with some nucleophiles such as aniline, phenacyltriphenylphosphonium bromide and 4-phenylthiosemicarbazide followed by treatment with thioglycolic acid, diethyl phosphite and/or acetic anhydride to yield a novel class of bis-pyrazoles containing sulfur and phosphorus derivatives. Most of the newly synthesized compounds were evaluated for their in vitro antimicrobial activities

Synthesis, antifungal activity and semi-empirical AM1-MO calculations of some new 4-oxo-4H-chromene derivatives

Some new antifungal agents have been prepared through reaction of 4-oxo-4H-chromene-3-carbaldehydes (1a,b) with some active primary amines (2a-e) and amides/thioamides (6a-d) in different conditions. Structures of the products were established on the basis of elemental analysis, IR, 1H NMR, mass spectra and semi-empirical AM1-MO calculations