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1 article(s) from Li, Zhi-ming

Synthesis of new tricyclic 5,6-dihydro-4H-benzo[b][1,2,4]triazolo[1,5-d][1,4]diazepine derivatives by [3⁺ + 2]-cycloaddition/rearrangement reactions

Lin-bo Luan,
Zi-jie Song,
Zhi-ming Li and
Quan-rui Wang

Beilstein J. Org. Chem. 2018, 14, 1826–1833, doi:10.3762/bjoc.14.155

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Figure 1: Examples of marketed pharmaceutical 1,2,4-triazolobenzodiazepines.

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Scheme 1: Preparation of N-acylated 2,3-dihydro-4(1H)-quinolones 6.

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Scheme 2: Synthesis of α-acetoxyazo compounds 8a–g. Reaction conditions: for synthesis of 8a: 7a (10.42 mmol)...

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Scheme 3: Synthesis of tricyclic benzo[b][1,2,4]triazolo[1,5-d][1,4]diazepinium salts 10. Reaction conditions...

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Scheme 4: Synthesis of N(1)-unsubstituted benzo[b][1,2,4]triazolo[1,5-d][1,4]diazepines 13. Reaction conditio...

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Scheme 5: Mechanistic rationale for the [3⁺ + 2]-cycloaddition/rearrangement reaction.

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Figure 2: Crystal structure of salt 10k. The displacement ellipsoids are drawn at the 30% probability level.

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Figure 3: Crystal structure of the free base 13e. The displacement ellipsoids are drawn at the 30% probabilit...

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Published 18 Jul 2018

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Synthesis of new tricyclic 5,6-dihydro-4H-benzo[b][1,2,4]triazolo[1,5-d][1,4]diazepine derivatives by [3+ + 2]-cycloaddition/rearrangement reactions

Synthesis of new tricyclic 5,6-dihydro-4H-benzo[b][1,2,4]triazolo[1,5-d][1,4]diazepine derivatives by [3⁺ + 2]-cycloaddition/rearrangement reactions