Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 17, Issue 12, Pages 3232-3238Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ob00179d
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Funding
- National Key Research and Development Program of China [2016YFD0201200]
- Tianjin Agricultural and Rural Work Committee [2016D01A016]
- Key Technologies R & D Program of Tianjin [17YFZX00470]
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A nitrogen-containing Lewis base catalyzed highly regioselective [4 + 2] cycloaddition of allene ketones or -methyl allene ketones with unsaturated pyrazolones has been disclosed to give the corresponding tetrahydropyrano [2,3-c] pyrazoles in moderate to good yields under mild conditions. High regioselectivity, 100% atom-economy, broad substrate scope and good functional group tolerance are attractive features of this process and make it a practical and versatile transformation.
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