[formula: see text] 1,3,5-Trisubstitutedpyrazolines and Hantzsch 1,4-dihydropyridines were converted to the corresponding pyrazoles and pyridines effectively by the treatment of a catalytic amount of Pd/C in acetic acid.
In the presence of activated carbon, Hantzsch 1,4-dihydropyridines and 1,3,5-trisubstitutedpyrazolines were aromatized with molecular oxygen to the corresponding pyridines and pyrazoles in excellent yields.
Hypervalent Iodine Oxidation of 1, 3, 5-Trisubstituted Pyrazolines: A Facile Synthesis of 1,3,5-Trisubstituted Pyrazoles
作者:Shiv P. Singh、Dalip Kumar、Om Prakash、R. P. Kapoor
DOI:10.1080/00397919708004136
日期:1997.8
Abstract 1, 3, 5-Trisubstituted pyrazolines (1a–i) undergo facile oxidation to the corresponding pyrazoles (2a–i) in the presence of iodobenzene diacetate.