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. Author manuscript; available in PMC: 2021 Oct 28.
Published in final edited form as: Chem Rev. 2020 Sep 24;120(20):11479–11615. doi: 10.1021/acs.chemrev.0c00523

Figure 79.

Figure 79.

Asymmetric hydrocyanation of benzaldehyde 5.1a to cyanohydrin 5.2a catalyzed by diketopiperazine 5.3 originally reported by Inoue and co-workers.36,202 Three limiting models for asymmetric induction (A, B, & C) have been proposed.