Parmar, Narsidas J. published the artcileSolvent-free, one-pot synthesis and biological evaluation of some new dipyrazolo [3,4-b:4′,3′-e]pyranylquinolones and their precursors, Related Products of pyrazoles-derivatives, the publication is Medicinal Chemistry Research (2014), 23(1), 42-56, database is CAplus.
One-pot synthesis of 24 new compounds, belonging to three families; dipyrazolo[3,4-b:4′,3′-e]pyranylquinolones and its precursors (pyrazolonylidene)methylquinolones and 4,4′-[(quinolinyl)methylene]bispyrazols, has been achieved in the presence of catalyst tetrabutylammonium hydrogen sulfate (TBA-HS) in solvent-free conditions. In addition to assuring chromatog.-free product isolation, this method had also allowed the reaction to proceed in a regio-selective manner provided the temperature and amount of pyrazolone are varied. At 100 °C, while 1:1 mixture of aldehyde 3 and pyrazolone 4 underwent Knoevenagel condensation, same reactants taken in ratio of 1:2 mainly domino/Knoevenagel-Michael reaction. At 120 °C, however, the domino/Knoevenagel-Michael-adducts converted into cyclized product, highlighting a new domino/Knoevenagel-Michael-cyclization synthetic sequence. The structure of all heterocycles has been confirmed by mass, IR and NMR spectral data. Based on 2D NMR NOESY experiment, it was also confirmed that the formation of only Z’ configuration of Knoevenagel alkene took place in the transformation. All are good antitubercular agents as they were found to be active against M. tuberculosis H37RV, in addition to being found active against three Gram-pos. (Streptococcus pneumoniae, Clostridium tetani, Bacillus subtilis) and three Gram-neg. (Salmonella typhi, Vibrio cholerae, Escherichia coli) bacteria, resp.
Medicinal Chemistry Research published new progress about 14580-22-4. 14580-22-4 belongs to pyrazoles-derivatives, auxiliary class Organic Pigment, name is 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone, and the molecular formula is C10H9ClN2O, Related Products of pyrazoles-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics