Synthesis and antidepressant and anxiolytic activity of derivatives of pyrazolo[4,3-c]pyridine and 4-phenylhydrazinonicotinic acids

Molecular structure, vibrational spectra, natural bond orbital and thermodynamic analysis of 3,6-dichloro-4-methylpyridazine and 3,6-dichloropyridazine-4-carboxylic acid by dft approach

“…The reported wavenumbers are expected to be accurate to ±1 cm À1 . 1 H and 13 C nuclear magnetic resonance (NMR) (300 MHz; CDCl3) spectra are recorded on a BRUKER instrument. Chemical shifts for protons are reported in parts per million scale (d scale) downfield from tetramethylsilane.…”

“…The hyper conjugative interaction energy was deduced from the second-order perturbation approach [30]. 1 H and 13 C chemical shifts are computed by adopting the standard GIAO/B3LYP/6-311++G(d,p) (Gauge-Independent Atomic Orbital) approach [31,32].…”

“…In order to furnish a definite assignment and analysis of 1 H and 13 C NMR spectra, theoretical calculations on chemical shift of DMP and DPC are done by gauge independent atomic orbital (GIAO) method at B3LYP/6-311++G ⁄⁄ level. The calculations are accomplished with CDCl 3 solvent effect.…”

“…Nitrogen-containing heterocyclic compounds have a diverse range of biological and pharmacological properties [1][2][3]. http Pyridazine and pyridine derivatives are the two most important heterocycles found in medicinal chemistry [4].…”

Synthesis and Antifungal <i>in Vitro</i> Evaluation of Pyrazolo[3,4-<i>b</i>]pyridines Derivatives Obtained by Aza-Diels–Alder Reaction and Microwave Irradiation

“…6,7) Recently we have developed several MAOS methodologies to obtain pyrazolo [3,4-b] pyridines, 2,[8][9][10][11][12][13] since they are an important group of nitrogen-containing fused heterocycles useful for medicinal and organic chemistry with a wide spectrum of biological and pharmacological activities [14][15][16] as antibacterial, antidepressant, anti-hyperglycemic, anti-inflammatory, antitumor, and anxiolytic agents and are being used in the treatment of Alzheimer's diseases, drugs addiction, and infertility. 7,[17][18][19][20][21][22][23] To continue within the framework of our interest to develop synthetic strategies to obtain functionalized and biologically interesting pyrazolo[3,4-b] pyridines, we wish to report an efficient MAOS method between N,N-dimethyl-N′-pyrazolylformimidamides 2,10,24,25) and β-nitrostyrenes to obtain 5-nitro-1-phenyl-pyrazolo [3,4-b] pyridines. 26,27) Considering that this type of compounds have previously shown good antimicrobial activities, including antifungal properties against Saccharomyces cerevisiae and Candida albicans, [28][29][30][31][32][33] we tested the new series of 5-nitro-1-phenylpyrazolo [3,4-b] pyridines for antifungal activities against two clinically important fungi C. albicans and Cryptococcus neoformans.…”