Journal
CHEMICAL SCIENCE
Volume 3, Issue 4, Pages 1231-1234Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2sc00963c
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Highly enantioselective [4 + 2] annulation of activated alkenes with alpha-substituted allenoates catalyzed by amino acid-based bifunctional phosphines has been developed for the first time, which provides an easy access to optically enriched functionalized cyclohexenes. In particular, 3-spirocyclohexene-2-oxindoles were prepared in high yields and with excellent enantioselectivities.
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