Asymmetric hydrogenations of glycoside derived β-ketoesters
摘要:
The catalytic hydrogenation of beta-ketoesters bearing a sugar moiety at C-3 is reported. Hydrogenations in the presence of chiral ruthenium(II) complexes are highly diastereoselective. The hydrogenation stereoselectivity of the ribose derived beta-ketoester was controlled by the catalyst. The C-5 substituent of the xylose derived beta-ketoester influenced the stereochemical course of the catalytic hydrogenation: the diastereoselectivity was controlled by the substrate if the C-5 substituent is a bulky group. (C) 2003 Published by Elsevier Ltd.
Asymmetric hydrogenations of glycoside derived β-ketoesters
摘要:
The catalytic hydrogenation of beta-ketoesters bearing a sugar moiety at C-3 is reported. Hydrogenations in the presence of chiral ruthenium(II) complexes are highly diastereoselective. The hydrogenation stereoselectivity of the ribose derived beta-ketoester was controlled by the catalyst. The C-5 substituent of the xylose derived beta-ketoester influenced the stereochemical course of the catalytic hydrogenation: the diastereoselectivity was controlled by the substrate if the C-5 substituent is a bulky group. (C) 2003 Published by Elsevier Ltd.
Asymmetric hydrogenations of glycoside derived β-ketoesters
作者:C. Thomassigny、C. Greck
DOI:10.1016/j.tetasy.2003.11.001
日期:2004.1
The catalytic hydrogenation of beta-ketoesters bearing a sugar moiety at C-3 is reported. Hydrogenations in the presence of chiral ruthenium(II) complexes are highly diastereoselective. The hydrogenation stereoselectivity of the ribose derived beta-ketoester was controlled by the catalyst. The C-5 substituent of the xylose derived beta-ketoester influenced the stereochemical course of the catalytic hydrogenation: the diastereoselectivity was controlled by the substrate if the C-5 substituent is a bulky group. (C) 2003 Published by Elsevier Ltd.