A conformational comparison of cyclo-[(S)-His-(S)-Leu] and cyclo-[(S)-His-(S)-Phe], catalysts for the asymmetric addition of HCN to aldehydes
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Add time:09/25/2019 Source:sciencedirect.com
Cyclo-[(S)-His-(S)-Leu] adopts a conformation in solution in which the imidazole ring is folded over the diketopiperazine ring. This is the opposite conformation to that determined for cyclo-[(S)-His-(S)-Phe], and may explain the opposite sense of asymmetric induction between the two catalysts.
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