Journal
ORGANIC LETTERS
Volume 11, Issue 7, Pages 1623-1625Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol9002898
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Funding
- National Natural Science Foundation of China [20821001, 20732006]
- National Basic Research Program of China [2009CB825300]
- Chinese Academy of Sciences
- Science and Technology Commission of Shanghai Municipality [07pj14106, 07JC14063]
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N-Heterocyclic carbene catalyzed ring expansion of readily accessible 2-acyl-l-formylcyclopropanes was developed. With 5 mol % of triazoliurn salt 5 and 30 mol % of DBU, ring expansion of various 2-acyl-l-formylcyclopropanes led to 3,4-dihydro-alpha-pyrones in good to excellent yields.
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