Journal
ORGANIC PROCESS RESEARCH & DEVELOPMENT
Volume 25, Issue 4, Pages 1074-1079Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.oprd.1c00007
Keywords
asymmetric hydrogenation; tetrasubstituted enamine; PTBP-SKEWPHOS; rhodium
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- TAKEDA
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A highly efficient rhodium-catalyzed asymmetric hydrogenation of a sterically hindered tetrasubstituted enamine was developed, providing quick and efficient access to a key synthetic chiral intermediate in the route to an active pharmaceutical ingredient. The new rhodium catalyst showed full conversion and high enantioselectivity in the asymmetric hydrogenation of the substrate, with P-31 NMR study conducted to characterize the catalyst.
A highly efficient rhodium-catalyzed asymmetric hydrogenation of a sterically hindered tetrasubstituted enamine (5) is disclosed, which facilitated quick and efficient access to a key synthetic chiral intermediate in the route to an active pharmaceutical ingredient. The new rhodium catalyst, prepared by combination of the cationic rhodium chiral diphosphine complex [Rh(cod){(2S,4S)-ptbp-skewphos}]OTf and potassium carbonate under pressurized hydrogen gas, gave full conversion and high enantioselectivity (>95% ee) in the asymmetric hydrogenation of 5. A P-31 NMR study of the new catalyst was performed.
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