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. Author manuscript; available in PMC: 2017 Oct 4.
Published in final edited form as: Angew Chem Int Ed Engl. 2016 Jun 22;55(41):12596–12624. doi: 10.1002/anie.201600547

Scheme 6.

Scheme 6

(A) Asymmetric Stetter reaction catalyzed by β-thiazolyl alanine derivatives. (B) X-ray crystal structure and line representation of one such catalyst. Red dotted lines indicate cation–π interactions. Adapted from ref. 32 with permission of the Royal Society of Chemistry. DIPEA = N.N-diisopropylethylamine.