Journal
CHEMICAL COMMUNICATIONS
Volume 52, Issue 8, Pages 1669-1672Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cc09592a
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Funding
- European Research Council (ERC) [320493]
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An enantioselective one-pot Michael addition/hydroalkoxylation reaction between 2-hydroxy-1,4-naphthoquinones and alkyne-tethered nitroalkenes catalyzed by a cinchona-derived squaramide and a silver(I) salt has been developed. The sequential protocol provides a direct access to 4H-pyranonaphthoquinones in moderate to very good yields and good to excellent enantioselectivities at a very low catalyst loading (0.5 mol%) of the squaramide.
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