Journal
ORGANIC LETTERS
Volume 21, Issue 17, Pages 6940-6945Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.9b02543
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Funding
- NSFC [21525207, 21772147]
- China Postdoctoral Science Foundation [BX20190253]
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A general protocol for the preparation of enantioenriched alpha-tetrasubstituted alpha-trifluoromethyl homoallylic amines is disclosed. Despite the significant challenge in stereoselectivity control, Ir-catalyzed asymmetric cascade umpolung allylation/2-aza-Cope rearrangement of trifluoromethylated fluorenone imines with allylic carbonates was realized with excellent efficiency and remarkable stereoselectivity. These were enabled by the suitable protective imino moiety and an unexpectedly exclusive E-geometrical imine of the allylation intermediate. This methodology is also applicable to facile access to chiral alpha-trisubstituted alpha-trifluoromethyl homoallylic amines in similarly high yield and stereoselectivity.
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