期刊
TETRAHEDRON
卷 57, 期 15, 页码 3087-3098出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4020(01)00166-1
关键词
biomimetic NADH model; asymmetric reduction; grafting; Merrifield resins
The synthesis of new chiral nicotinamide adenine dinucleotide hydrogenated models derived from quinoline is described. Using a biomimetic approach, the out-of-plane positioning of the amide carbonyl was obtained by involving the chiral auxiliary in a lactam structure. It is shown that electron-donating groups on the benzene ring of the quinoline structure are necessary to obtain high chemical yields during the reduction of methyl benzoylformate. An interesting variation of the enantioselectivity as a function of magnesium ion concentration has been observed. Under the best conditions, methyl mandelate was obtained in up to 95% ee (R). To facilitate the recycling of these models, grafting of reagent 4 on a Merrifield resin has been developed. The resulting polymer-supported reagent 4 was tested in the asymmetric reduction of methyl benzoylformate. (C) 2001 Elsevier Science Ltd. All rights reserved.
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