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2 article(s) from Wippert, Nicolai

Synthesis of substituted triazole–pyrazole hybrids using triazenylpyrazole precursors

Simone Gräßle,
Laura Holzhauer,
Nicolai Wippert,
Olaf Fuhr,
Martin Nieger,
Nicole Jung and
Stefan Bräse

Beilstein J. Org. Chem. 2024, 20, 1396–1404, doi:10.3762/bjoc.20.121

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Figure 1: Biologically active pyrazole–triazole hybrids 1–4: inhibitory effect on cholera bacteria [13], antimicr...

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Scheme 1: Literature-reported synthetic routes to pyrazole–triazole hybrids: synthesis of azides 7 or 8 from ...

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Scheme 2: Synthesis of pyrazolyl azides 19a–v via cleavage of the protecting triazene moiety. For compounds 1...

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Scheme 3: Synthesis of pyrazole–triazole hybrids via CuAAC and ORTEP diagrams of triazole products 21sd and 2...

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Figure 2: Synthesized triazole–pyrazole hybrids 21aa–vg.

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Scheme 4: One-pot synthesis of triazole–pyrazole hybrid 21gd. ^aOne-pot setup yielded 21gd with unknown impuri...

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Scheme 5: Solid-phase synthesis of azidopyrazole 19g and triazole–pyrazole hybrid 21gd by immobilization of a...

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Published 20 Jun 2024

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Synthesis of new pyrazolo[1,2,3]triazines by cyclative cleavage of pyrazolyltriazenes

Nicolai Wippert,
Martin Nieger,
Claudine Herlan,
Nicole Jung and
Stefan Bräse

Beilstein J. Org. Chem. 2021, 17, 2773–2780, doi:10.3762/bjoc.17.187

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Scheme 1: Synthesis of 3,6-dihydro-4H-pyrazolo[3,4-d][1,2,3]triazin-4-ones 2a,b by diazotization of 3-amino-1H...

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Figure 1: Structural differences of several known (2–4) and so far unknown (5 and 6) pyrazolo[3,4-d][1,2,3]-3H...

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Scheme 2: Synthesis of 3,4-dihydrobenzo[d][1,2,3]triazine derivatives 8 from triazene-containing precursors 7 ...

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Scheme 3: Planned retrosynthesis to obtain 4,6-dihydropyrazolo[3,4-d][1,2,3]-3H-triazines 5 and 4,7-dihydropy...

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Figure 2: Molecular structures of compounds 12h (A) and 13c (B) representing both possible regioisomers of th...

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Scheme 4: Cleavage of the triazene protective group and cyclization of the resulting diazonium intermediate y...

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Figure 3: Graphical overview about selected pyrazolo[1,2,3]triazines 5 and intermediates 9, 12, and 13 and th...

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Published 22 Nov 2021

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