EFFICIENT SYNTHESIS OF 4-ETHOXYCARBONYL PYRAZOLIN-5-ONE DERIVATIVES
摘要:
Concise and efficient methods for the preparation of 3-substituted 4-ethoxycarbonylpyrazolin-5-ones are described. The synthetic strategies involve carbon-acylation in the presence of base, followed by ring cyclization With hydrazine or hydrazine monohydrochloride.
Reactivity of α-acylated β-enamino ketones and esters: Synthesis of pyrazoles
作者:Lauri J. Missio、Hugo S. Braibante、Mara E. F. Braibante
DOI:10.1002/jhet.5570330441
日期:1996.7
The reactivity of the enamino compounds 4-amino-3-phenylamino(thio)carbonyl-3-penten-2-one 1 and 2 and ethyl 3-amino-2-phenylamino(thio)carbonyl-2-butyrate 7 and 8 was studied using the reaction with hydrazine hydrate and hydrazine hydrochloride to evaluate the 1,3 electrophilic center of the compounds by the formation of the pyrazole rings. The pyrazoles 3, 4, 5, 9, 11 and 13 were obtained depending