Journal
ISRAEL JOURNAL OF CHEMISTRY
Volume 56, Issue 6-7, Pages 522-530Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ijch.201500102
Keywords
annulation; cyclopentane; donor-acceptor cyclopropanes; enantioselectivity; N-heterocyclic carbene
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Funding
- Australian Research Council [DP0881137, DP12010131, DP150101522, FT110100319]
- Australian Research Council [DP0881137, FT110100319] Funding Source: Australian Research Council
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Donor-acceptor cyclopropanes are known to serve as dipole precursors capable of engaging in (3+2) annulations with electron-deficient -systems. In 2013, the reaction of donor-acceptor cyclopropanes with ,-unsaturated acyl fluorides in an all-carbon (3+2) annulation was discovered. The reaction proceeds in good yields using the IMes NHC to provide diastereomerically pure -lactone-fused cyclopentanes bearing four contiguous stereocentres. Subsequent studies demonstrated that N-t-butyl substituted homochiral morpholinone NHCs allowed the reaction to be achieved in up to 98% ee. In this account, a background to this reaction is introduced, along with a complete account of the strengths, limitations and challenges encountered while developing this chemistry.
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