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Org Lett. 2004 Sep 30;6(20):3645-7.

Highly enantioselective asymmetric hydrogenation of beta-acetamido dehydroamino acid derivatives using a three-hindered quadrant rhodium catalyst.

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  • 1Pfizer, Inc., 2800 Plymouth Road, Ann Arbor, Michigan 48105, USA.

Abstract

[reaction: see text] A previously reported three-hindered quadrant chiral ligand and its corresponding rhodium complex provide high enantioselectivity for the asymmetric hydrogenation of beta-acetamido dehydroamino acid substrates. Both (E)- and (Z)-substrates are hydrogenated with high enantioselectivity in all of the reported examples. Asymmetric hydrogenation of a cyclic beta-acetamido dehydroamino acid substrate in 85% ee is also reported.

PMID:
15387569
[PubMed - indexed for MEDLINE]

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