Efficient Synthesis of Fully Substituted and Diversely Functionalized Pyrazoles through <i>p</i>‐TSA Catalyzed One‐Pot Condensation of Cyclic <i>β</i>‐Diketones, Arylglyoxals and Arylhydrazones
作者:Arun Dhurey、Subhro Mandal、Animesh Pramanik
DOI:10.1002/ejoc.202300770
日期:2023.10.21
An acid catalyzed one-pot condensation of readily available cyclic β-diketones, arylglyoxals and arylhydrazones produces a library of diverselyfunctionalized pyrazole derivatives in excellent yield under metal-catalyst-free benign conditions.
Ghabrial, Sami S.; Moharram, Hussein H.; Aziz, Suzan I., Heterocycles, 1985, vol. 23, # 5, p. 1161 - 1166
作者:Ghabrial, Sami S.、Moharram, Hussein H.、Aziz, Suzan I.
DOI:——
日期:——
New strategy for the regioselective synthesis of 1-phenyl-3-trifluoromethyl-1H-pyrazoles
作者:Nilo Zanatta、Simone S. Amaral、Josiane M. dos Santos、Andréia M.P.W. da Silva、Juliana M.F.M. Schneider、Liana da S. Fernandes、Helio G. Bonacorso、Marcos A.P. Martins
DOI:10.1016/j.tetlet.2013.05.103
日期:2013.7
A regioselective synthesis of 3-trifluoromethyl-1-phenyl-1H-pyrazoles (1,3-isomers) as well as their 1,5-isomers (5-trifluoromethyl-1-phenyl-1H-pyrazoles), is described. The 1,3-isomers were obtained from the reaction of 4-alkoxy-1,1,1-trifluoroalk-3-en-2-ones with arylhydrazones followed by deprotective hydrolysis while the 1,5-isomer was obtained by direct cyclocondensation of 4-alkoxy-1,1,1-trifluoroalk-3-en-2-ones with phenylhydrazine. An unequivocal assignment of the 1,3- and 1,5-isomers of the pyrazole products is given. (C) 2013 Elsevier Ltd. All rights reserved.
MOHAMED M. M.; EL HASHASH M. A.; EL KADY M. Y.; HASSAN M. A., REV. ROUM. CHIM., 1980, 25, NO 2, 237-244
作者:MOHAMED M. M.、 EL HASHASH M. A.、 EL KADY M. Y.、 HASSAN M. A.