Unexpected results in the heterocyclization of 5-acetylenylpyrazole-4- carboxylic acid hydrazides under the influence of CuCl: Formation of a diazepinone and dehydrodimerization into the corresponding bis(pyrazolo[4,3-d] [1,2]diazepinone)

Abstract

The simple reaction of cyclization of hydrazides of vic-acetylenylbenzoic and acetylenylpyrazole carboxylic acid can lead to four different compounds: five-membered N-aminolactams, six-membered N-aminolactams, six-membered diazinones and diazepinones, but only the first three have been described. In this paper we report the unexpected formation of a bis(pyrazolo[4,3-d][1,2] diazepinone, the structure of which has been established by X-ray crystallography.

Original language	English
Pages (from-to)	4457-4459
Number of pages	3
Journal	Tetrahedron Letters
Volume	46
Issue number	26
DOIs	https://doi.org/10.1016/j.tetlet.2005.04.127
Publication status	Published - 27 Jun 2005
Externally published	Yes

Keywords

Cross-coupling
Hetarylacetylenes
Heterocyclization
Pyrazolopyridines

ASJC Scopus subject areas

Biochemistry
Drug Discovery
Organic Chemistry

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10.1016/j.tetlet.2005.04.127

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Vasilevsky, S. F., Mshvidobadze, E. V., Mamatyuk, V. I., Romanenko, G. V., & Elguero, J. (2005). Unexpected results in the heterocyclization of 5-acetylenylpyrazole-4- carboxylic acid hydrazides under the influence of CuCl: Formation of a diazepinone and dehydrodimerization into the corresponding bis(pyrazolo[4,3-d] [1,2]diazepinone). Tetrahedron Letters, 46(26), 4457-4459. https://doi.org/10.1016/j.tetlet.2005.04.127

Unexpected results in the heterocyclization of 5-acetylenylpyrazole-4- carboxylic acid hydrazides under the influence of CuCl : Formation of a diazepinone and dehydrodimerization into the corresponding bis(pyrazolo[4,3-d] [1,2]diazepinone). / Vasilevsky, Sergei F.; Mshvidobadze, Elena V.; Mamatyuk, Victor I.; Romanenko, Galina V.; Elguero, Jose.

In: Tetrahedron Letters, Vol. 46, No. 26, 27.06.2005, p. 4457-4459.

Research output: Contribution to journal › Article › peer-review

Vasilevsky, SF, Mshvidobadze, EV, Mamatyuk, VI, Romanenko, GV & Elguero, J 2005, 'Unexpected results in the heterocyclization of 5-acetylenylpyrazole-4- carboxylic acid hydrazides under the influence of CuCl: Formation of a diazepinone and dehydrodimerization into the corresponding bis(pyrazolo[4,3-d] [1,2]diazepinone)', Tetrahedron Letters, vol. 46, no. 26, pp. 4457-4459. https://doi.org/10.1016/j.tetlet.2005.04.127

Vasilevsky SF, Mshvidobadze EV, Mamatyuk VI, Romanenko GV, Elguero J. Unexpected results in the heterocyclization of 5-acetylenylpyrazole-4- carboxylic acid hydrazides under the influence of CuCl: Formation of a diazepinone and dehydrodimerization into the corresponding bis(pyrazolo[4,3-d] [1,2]diazepinone). Tetrahedron Letters. 2005 Jun 27;46(26):4457-4459. https://doi.org/10.1016/j.tetlet.2005.04.127

Vasilevsky, Sergei F. ; Mshvidobadze, Elena V. ; Mamatyuk, Victor I. ; Romanenko, Galina V. ; Elguero, Jose. / Unexpected results in the heterocyclization of 5-acetylenylpyrazole-4- carboxylic acid hydrazides under the influence of CuCl : Formation of a diazepinone and dehydrodimerization into the corresponding bis(pyrazolo[4,3-d] [1,2]diazepinone). In: Tetrahedron Letters. 2005 ; Vol. 46, No. 26. pp. 4457-4459.

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