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Wippert N, Nieger M, Herlan C, Jung N, Bräse S. Synthesis of new pyrazolo[1,2,3]triazines by cyclative cleavage of pyrazolyltriazenes. Beilstein J Org Chem 2021; 17:2773-2780. [PMID: 34900007 PMCID: PMC8630434 DOI: 10.3762/bjoc.17.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 10/05/2021] [Indexed: 11/23/2022] Open
Abstract
We describe the synthesis of so far synthetically not accessible 3,6-substituted-4,6-dihydro-3H-pyrazolo[3,4-d][1,2,3]triazines as nitrogen-rich heterocycles. The target compounds were obtained in five steps, including an amidation and a cyclative cleavage reaction as key reaction steps. The introduction of two side chains allowed a variation of the pyrazolo[3,4-d][1,2,3]triazine core with commercially available building blocks, enabling the extension of the protocol to gain other derivatives straightforwardly. Attempts to synthesize 3,7-substituted-4,7-dihydro-3H-pyrazolo[3,4-d][1,2,3]triazines, the regioisomers of the successfully gained 3,6-substituted 4,6-dihydro-3H-pyrazolo[3,4-d][1,2,3]triazines, were not successful under similar conditions due to the higher stability of the triazene functionality in the regioisomeric precursors and thus, the failure of the removal of the protective group.
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Affiliation(s)
- Nicolai Wippert
- Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology, Campus North, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Martin Nieger
- Department of Chemistry, University of Helsinki, P.O. Box 55 (A. I. Virtasen aukio 1), 00014 University of Helsinki, Finland
| | - Claudine Herlan
- Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology, Campus North, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Nicole Jung
- Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology, Campus North, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.,Institute of Organic Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Stefan Bräse
- Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology, Campus North, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.,Institute of Organic Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
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Ivanov SM, Shestopalov AM. Metalated Azolo[1,2,4]triazines. I. Synthesis of 2‐(6‐tert‐Butyl‐5‐oxo‐4,5‐dihydro‐1,2,4‐triazin‐3(2H)‐ylidene)acetonitrilesviaRing Opening Degradation of 3‐tert‐Butyl‐7‐lithio‐4‐oxo‐4H‐pyrazolo[5,1‐c][1,2,4]triazin‐1‐ides. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3615] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sergey M. Ivanov
- Laboratory of Medicinal Chemistry (N17)N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky Prospekt, 47 Moscow 119991 Russia
| | - Anatoliy M. Shestopalov
- Laboratory of Medicinal Chemistry (N17)N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky Prospekt, 47 Moscow 119991 Russia
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Ivanov SM, Mironovich LM, Rodinovskaya LA, Shestopalov AM. The first stable examples of compounds containing both diazonium and acyl azide, and synthesis of a new pyrazino[2′,3′:3,4]pyrazolo[5,1- c ][1,2,4]triazin-4(6 H )-one heterocyclic system. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.03.083] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Mironovich LM, Shcherbinin DV. 7-tert-butyl[1,2,4]triazino[4',3':1,5]pyrazolo[3,4-d][1,2,3]triazine-4,8(3Н,9Н)-dione in nucleophilic substitution reactions. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2016. [DOI: 10.1134/s1070428016020238] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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