Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 353, Issue 2-3, Pages 483-493Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201000701
Keywords
[3+2] annulations; conjugated dienes; hexahydroisoindolones; imines; phosphine organocatalysis
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Funding
- ICSN
- Agence Nationale de la Recherche (ANR)
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A new synthetic approach to hexahydroisoindol-4-ones is reported, based on the formal [3+2] cyclization reaction between N-arylsulfonylimines and cyclic conjugated dienes, under phosphine catalysis. Key substrates are 3-vinylcyclohex-2-enones with electron-withdrawing substituents (ester, amido, cyano, phosphoryl and keto groups) on the exocyclic double bond, which afford the three-atom synthons for the construction of the pyrroline ring. Total syn stereoselectivity is observed in these annulations. The scope of the reaction has been demonstrated and mechanistic issues are considered, based on deuteration experiments and density function theory (DFT) calculations.
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