Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 17, Issue -, Pages 2773-2780Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.17.187
Keywords
cyclization; diazonium chemistry; pyrazoles; triazenes; triazines
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Funding
- Helmholtz program Biointer-faces in Technology and Medicine (BIFTM)
- Deutsche Forschungsgemeinschaft [284178167]
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This study describes the synthesis of 3,6-substituted-4,6-dihydro-3H-pyrazolo[3,4-d][1,2,3]triazines, nitrogen-rich heterocycles that were previously not accessible synthetically. The compounds were obtained in five steps, including key reaction steps of amidation and cyclative cleavage. Attempts to synthesize regioisomers were unsuccessful due to the higher stability of the triazene functionality in the precursors.
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 reac-tion 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-substi-tuted 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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