3 years ago

Enantioselective [4 + 1]-Annulation of α,β-Unsaturated Imines with Allylic Carbonates Catalyzed by a Hybrid P-Chiral Phosphine Oxide–Phosphine

Enantioselective [4 + 1]-Annulation of α,β-Unsaturated Imines with Allylic Carbonates Catalyzed by a Hybrid P-Chiral Phosphine Oxide–Phosphine
Jiesi Luo, Xizhen Yi, Hanyuan Li, Zhengjie He, Bojuan Li
A highly enantio- and diastereoselective [4 + 1]-annulation reaction between α,β-unsaturated imines and allylic carbonates has been realized under the catalysis of a novel hybrid P-chiral phosphine oxide–phosphine, providing enantioenriched polysubstituted 2-pyrrolines in good to excellent yields and up to 99% ee. Based on Han’s methods, the catalyst featuring a sole P(O)-chirality in the molecule is readily accessible and represents a class of new chiral phosphine organocatalysts. In the plausible catalytic mechanism, an intramolecular Coulombic interaction between the in situ generated phosphonium cation and polar chiral P═O moiety may play a positive role.

Publisher URL: http://dx.doi.org/10.1021/acs.orglett.7b02800

DOI: 10.1021/acs.orglett.7b02800

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