Frontispiece: Copper‐ or Thermally Induced Divergent Outcomes: Synthesis of 4‐Methyl 2H‐Chromenes and Spiro‐4H‐Pyrazoles

An unprecedented divergent transformation of alkyne‐tethered N‐sulfonyl hydrazones via intermediate 3H‐pyrazole, which provides an efficient access to 2H‐chromenes and spiro‐4H‐pyrazoles in the presence of copper catalyst or under thermal conditions, is reported. To the best of our knowledge, this i...

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Bibliographic Details
Published in:Chemistry : a European journal 2018-05, Vol.24 (26), p.n/a
Main Authors: Zheng, Yang, Qiu, Lihua, Hong, Kemiao, Dong, Shanliang, Xu, Xinfang
Format: Article
Language:English
Subjects:
Alkynes
Chemistry
chromenes
Copper
Hydrazones
N-sulfonyl hydrazine
Pyrazole
Pyrazoles
Sulfonation
X-ray diffraction
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Summary:An unprecedented divergent transformation of alkyne‐tethered N‐sulfonyl hydrazones via intermediate 3H‐pyrazole, which provides an efficient access to 2H‐chromenes and spiro‐4H‐pyrazoles in the presence of copper catalyst or under thermal conditions, is reported. To the best of our knowledge, this is the only example of sulfonation that goes through a cascade process involving 3H‐pyrazole, which is confirmed by X‐ray diffraction analysis. For full details see the Communication by L. Qiu, X. Xu et al. on page 6705 ff.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201882664