Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 6, Issue 3, Pages 677-680Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cy02051d
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During studies on the enantioselective hydrogenation of unfunctionalised enamines, a very surprising switch in enantiopreference was observed; [((R,R)-Et-DUPHOS)-Rh(COD)]BF4 hydrogenates an enamine to give (R)-amine with up to 73% ee, but when iodine is added as a co-catalyst, the (S)-amine is formed with up to 61% ee. Mechanistic studies implicate a protonationiminium ion reduction pathway.
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