Journal
INORGANICA CHIMICA ACTA
Volume 357, Issue 13, Pages 4024-4028Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2004.07.040
Keywords
cobalt; carbonylation; oxazoline; beta-amino acid derivative
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The stereospecificity of the title reaction is studied using the (4R,5S)-4-methyl-2,5-diphenyl-2-oxazoline and (4R,5R)-4-methyl-2,5-diphenyl-2-oxazoline as the substrates. While the catalyst system containing BnCo(CO)(4) and BnCOCo(CO)(4) (1) was used initially, a convenient catalyst formulation generated from the commercially available Co-2(CO)(8) and AIBN (2) has been found more effective than catalyst system 1. The stereoselectivity in all cases favors inversion at the C(5)-position with diastereomeric excess up to >97%. (C) 2004 Elsevier B.V. All rights reserved.
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