Rhodium-Catalyzed and Zinc(II)-Triflate-Promoted Asymmetric Hydrogenation of Tetrasubstituted α,β-Unsaturated Ketones
作者:Joel R. Calvin、Michael O. Frederick、Dana L. T. Laird、Jacob R. Remacle、Scott A. May
DOI:10.1021/ol203264a
日期:2012.2.17
The asymmetrichydrogenation of tetrasubstitutedα,β-unsaturatedketones has been accomplished using an in situ formed rhodium-Josiphos catalyst. The reaction is enhanced by addition of catalytic zinc(II) triflate, which significantly improves turnover frequency while suppressing epimerization of the products.