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. 2016 Nov 25;138(50):16345–16354. doi: 10.1021/jacs.6b09243

Figure 1.

Figure 1

(a) Catalytic cycle proposed for the Brønsted acid catalyzed enantioselective reduction of imines with Hantzsch-1,4-dihydropyridine ester 1.9,11 (b) Experimental observables used in this study to characterize the hydrogen bond interaction in (R)-TRIP imine complexes.