A simple, highly efficient, and environmentally friendly method for the synthesis of substituted 1H-pyrazoles by one-pot condensation reaction of α,β-unsaturated carbonyl compounds with tosyl hydrazide in water was developed. The reaction system exhibited tolerance with various functional groups, Aromatic moiety with both electron-rich and electron-deficient substituents could give desired products
Reactivity of<i>p</i>-phenyl substituted β-enamino compounds using k-10/ultrasound. I. synthesis of pyrazoles and pyrazolinones
作者:Claudete J. Valduga、Hugo S. Braibante、Mara E. F. Braibante
DOI:10.1002/jhet.5570350136
日期:1998.1
The reactivity of the β-enamino ketones, 3-amino-1-(p-phenyl-substituted)-2-buten-1-ones 1a-d and β-enamino esters. Ethyl-3-amino-3-(p-phenyl-substituted)-2-propenoates 5a-d were evaluated by systematic studies of the reactions with hydrazine and methylhydrazine by reactions with solid support K-10/ultrasound and homogeneous media (reflux in ethanol or dichloromethane) yielding pyrazole rings 2a-d
Reactivity of<i>p</i>-phenyl substituted β-enamino compounds using K-10/ultrasound.<b>I</b>. Synthesis of pyrazoles and pyrazolinones
作者:Claudete J. Valduga、Hugo S. Braibante、Mara E. F. Braibante
DOI:10.1002/jhet.5570340513
日期:1997.9
The reactivity of the β-enamino ketones, 3-amino-1-(p-phenyl-substituted)-2-buten-1-ones 1a-d and β-enamino esters, ethyl 3-amino-3-(p-phenyl-substituted)-2-propenoates 5a-d was systematically studied when allowed to react with hydrazine and methylhydrazine under solid support K-10/ultrasound conditions and in homogeneous media (reflux in ethanol or dichloromethane). The products were pyrazoles 2a-d