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Switchable Ring-Contractive Extrusion Reactions of 2,5-Dihydro-1,4,5-thiadiazepine <i>S</i>-Oxides: Entries to Pyridazines or Pyrazoles

Bin Cheng, Yuntong Li, Hui Li, Xinping Zhang, Taimin Wang, Yun Li, Hongbin Zhai

The Journal of Organic Chemistry · 2019 · 15 citations · 26 references

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Abstract

Switchable ring-contractive extrusion reactions of 2,5-dihydro-1,4,5-thiadiazepine S-oxides are described, which allow expedient access to pyridazines under thermal conditions or pyrazoles under Lewis acid-mediated conditions.

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