139527-16-5Relevant articles and documents
Application of a one-pot lipase resolution strategy for the synthesis of chiral γ- and δ-lactones
Kamal, Ahmed,Sandbhor, Mahendra,Shaik, Ahmad Ali
, p. 1575 - 1580 (2007/10/03)
A successful one-pot reduction of γ-ketoesters, δ-ketoesters and lactones to the corresponding 1,4- and 1,5-diols followed by a lipase catalyzed kinetic resolution coupled with hydrolysis to afford optically active diols is described. The synthetic utility of this one-pot method was illustrated by the oxidation of these chiral diols to respective chiral γ-butyrolactone and δ-lactones. Lipase from Pseudomonas cepacia, immobilized on ceramic afforded the product with high enantiomeric excess in good yields under mild reaction conditions. This approach has been used to develop a convenient enantioselective route for several γ- and δ-lactones using achiral and corresponding racemic starting material.
A New Approach to Remote Asymmetric Induction in the Diastereoselective Reduction of γ-Keto Esters by Use of a Chiral Podand as Chiral Auxiliary
Tamai, Yasufumi,Koike, Shinji,Ogura, Atsuhiko,Miyano, Sotaro
, p. 799 - 800 (2007/10/02)
An efficient 1,7-asymmetric induction was achieved with up to 82percent diastereoisomeric excess (d.e.) in the diastereoselective reduction of the γ-keto ester 4 and o-acetylbenzoate 6 using a chiral podand 2 as a chiral auxiliary.