The title compounds, obtained by 1,4-addition of sarcosine or glycine ethyl ester on conjugated azoalkenes, gave the 1-ureido-4-amino-3-methyl-1H-pyrazol-5(2H)-ones through a base promoted heterocyclization process, while in the presence of copper (I) species the 1-ureido-5-methyl-4-imidazolines and the 4-methoxycarbonyl-5-methyl-1-ureidoimidazole were obtained. The mechanism of these reactions is discussed.
Base or copper promoted annulation reactions of α-aminohydrazones / A. Arcadi, O.A. Attanasi, L. De Crescentini, E. Rossi. - In: TETRAHEDRON LETTERS. - ISSN 0040-4039. - 38:12(1997), pp. 2329-2332.
Base or copper promoted annulation reactions of α-aminohydrazones
E. RossiUltimo
1997
Abstract
The title compounds, obtained by 1,4-addition of sarcosine or glycine ethyl ester on conjugated azoalkenes, gave the 1-ureido-4-amino-3-methyl-1H-pyrazol-5(2H)-ones through a base promoted heterocyclization process, while in the presence of copper (I) species the 1-ureido-5-methyl-4-imidazolines and the 4-methoxycarbonyl-5-methyl-1-ureidoimidazole were obtained. The mechanism of these reactions is discussed.
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