Monobenzylether of (R,R)-1,2-diphenylethane-1,2-diol as chiral auxiliary in the diastereoselective reduction of α-ketoesters
摘要:
The alpha-ketoester 4a, prepared in 3 steps from (R,R)-1,2-diphenylethane-1,2-diol can be reduced with several agents providing the corresponding alpha-hydroxyester 5 with diastereoselectivites up to 56%. This selectivity has been interpreted as due to carbonyl face-shielding by the stacked OCH2Ph moiety of 4a. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Monobenzylether of (R,R)-1,2-diphenylethane-1,2-diol as chiral auxiliary in the diastereoselective reduction of α-ketoesters
摘要:
The alpha-ketoester 4a, prepared in 3 steps from (R,R)-1,2-diphenylethane-1,2-diol can be reduced with several agents providing the corresponding alpha-hydroxyester 5 with diastereoselectivites up to 56%. This selectivity has been interpreted as due to carbonyl face-shielding by the stacked OCH2Ph moiety of 4a. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.