Journal
CHEMICAL COMMUNICATIONS
Volume 52, Issue 98, Pages 14093-14096Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cc06935e
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Funding
- MEXT [24550128]
- RIKEN
- JSPS
- Grants-in-Aid for Scientific Research [24550128] Funding Source: KAKEN
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We present a copper-catalyzed oxidative cyclization of beta, gamma-unsaturated hydrazones, utilizing molecular oxygen as a stoichiometric oxidant. The methodology provides distinct classes of pyrazoles simply by changing the reaction solvent. Tris-substituted pyrazoles, having a ketone functionality at the C-5 position, were obtained as the major product in ethanol, while di-substituted pyrazoles were predominantly formed in 1,1,1,3,3,3-hexafluoro-2-propanol.
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