Several new porphyrins have been prepared in improved yields using an established method which was adapted to formylpyrazoles bearing on the pyrazole N1-nitrogen protective groups. The deprotection of N-para-methoxybenzyl and SEM protected meso-pyrazolylporphyrins afforded the first known pyrazolylporphyrins with pyrazole free NH groups. The crystal and molecular structure of meso-tetrakis-1-(benz
Scope and Limitations in the Regioselective Synthesis of 1,3,5-Trisubstituted Pyrazoles from b-Amino Enones and Hydrazine Derivatives. 13C-Chemical Shift Prediction Rules for 1,3,5-Trisubstituted Pyrazoles
作者:Alfonso González-Ortega、M. Luisa Sádaba、Angel Alberola、Luis Calvo Bleye、M. Carmen Sañudo
DOI:10.3987/com-00-9102
日期:——
Tarrago, Georges; Ramdani, Abdelkrim; Elguero, Jose, Journal of Heterocyclic Chemistry, 1980, vol. 17, # 1, p. 137 - 142
Efficient one-pot synthesis of substituted pyrazoles
作者:Meng Tang、Fu-Min Zhang
DOI:10.1016/j.tet.2012.12.038
日期:2013.2
An efficient, one-potsynthesis of substituted pyrazoles from enones, hydrazides, and halides was developed. In comparison with the classical Knorr pyrazolesynthesis, this methodology gave a different type of product (R3≥R5). A range of substituted pyrazoles were prepared in good to high yields with complete regioselectivity.