Journal
ORGANIC LETTERS
Volume 17, Issue 6, Pages 1417-1420Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.5b00293
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- CSIR-New Delhi [ORIGIN-CSC0108]
- CSIR-OSDD [HCP0001]
- CSIR-New Delhi
- UGC
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The N-heterocyclic carbene (NHC)-organocatalyzed enantioselective annulation reaction of pyrazolones with alpha,beta-unsaturated aldehydes proceeding via the chiral alpha,beta-unsaturated acyl azolium intermediates under oxidative conditions is presented. The reaction afforded dihydropyranone-fused pyrazoles in moderate to good yields and good er values under operationally simple and base-free conditions.
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