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. 2016 Jun 1;7(6):3775-3779.
doi: 10.1039/c5sc04151a. Epub 2016 Feb 23.

Asymmetric [3 + 2] cycloaddition of donor-acceptor aziridines with aldehydes via carbon-carbon bond cleavage

Affiliations

Asymmetric [3 + 2] cycloaddition of donor-acceptor aziridines with aldehydes via carbon-carbon bond cleavage

Yuting Liao et al. Chem Sci. .

Abstract

An enantioselective [3 + 2] annulation of donor-acceptor aziridines with aldehydes has been realized using a Nd(OTf)3/N,N'-dioxide/LiNTf2 catalyst system, providing various chiral cis-1,3-oxazolidines in moderate to good yields with high levels of stereocontrol. A relay catalytic process is proposed where LiNTf2 promotes the formation of azomethine ylide intermediates, and a chiral Nd(iii)-N,N'-dioxide complex accelerates the asymmetric cycloaddition.

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Figures

Scheme 1
Scheme 1. Asymmetric [3 + 2] cycloadditions of racemic aziridines.
Fig. 1
Fig. 1. (a) ee traces of the product 3kh and the substrate 1k of the reaction. (b) Reaction time profile of the reactions with or without LiNTf2.
Scheme 2
Scheme 2. Control experiments.
Scheme 3
Scheme 3. A plausible catalytic cycle.

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