Journal
TETRAHEDRON LETTERS
Volume 49, Issue 5, Pages 755-759Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.11.201
Keywords
phosphites; asymmetric hydrogenation; rhodium; enantioselective catalysis
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The Rh-catalyzed hydrogenations of dimethyl itaconate and methyl acetamido acrylate using selected heterocombinations of pentafluorobenzyl- and methoxybenzyl-derived binaphthyl phosphites proved to be highly enantioselective (ee 93-99%). In these selected cases the Rh-heterocomplexes, which were formed in a statistical amount (ca. 50% by (31)P NMR), turned out to be more active and selective than the two homocomplexes. (C) 2007 Elsevier Ltd. All rights reserved.
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