期刊
TETRAHEDRON LETTERS
卷 48, 期 26, 页码 4623-4626出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.04.090
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A synthesis of N-acetylcolchinol, a key intermediate in the synthesis of ZD6126, was developed. The enantiodifferentiating step required the catalytic asymmetric hydrogenation of an enamide. After screening a range of metal and ligand combinations it was found that (S,S)-Pr-i-FerroTANE Ru(methallyl)(2) and [(S,S)-'BuFerroTANE Rh(COD)]BF4 gave both high enantioselectivity (>90% ee) and high catalyst utility (molar S/C= 1000). (c) 2007 Elsevier Ltd. All rights reserved.
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