Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 81, Issue 18, Pages 8287-8295Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.6b01375
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Funding
- Norwegian Research Council [FRIPRO-FRINATEK 230470]
- School of Pharmacy, University of Oslo
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Asymmetric bromolactonization reactions of delta-unsaturated carboxylic acids have been investigated in the presence of 10 chiral squaramide hydrogen-bonding organocatalysts. The best catalyst enabled the cyclization of several 5-arylhex-5-enoic acids into the corresponding bromolactones with up to 96% ee and in high to excellent chemical yields. The reported catalysts are prepared in a straightforward manner in two steps from dimethyl squarate. The utility of the developed protocol was demonstrated in highly enantioselective syntheses of the sesquiterpenoids (-)-gossoronol and (-)-boivinianin B. Both natural products were obtained in >= 99% enantiomeric excess.
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