Enzyme-Promoted Direct Asymmetric Michael Reaction by Using Protease from Streptomyces griseus
作者:Ling-Ling Wu、Ling-Po Li、Yang Xiang、Zhi Guan、Yan-Hong He
DOI:10.1007/s10562-017-2095-4
日期:2017.8
AbstractThe directasymmetric Michael addition of malonates and enones was promoted by protease from Streptomyces griseus for the first time. Yields of up to 84% with enantioselectivities of up to 98% enantiomeric excess (ee) were achieved under optimized conditions.Graphical AbstractProtease from Streptomyces griseus (SGP) was used for the first time as a biocatalyst in asymmetric Michael reaction of malonates
Siloxy amino acid lithium salt, O-tert-butyldiphenylsilyl l-serine lithium salt, was found to be an effective catalyst for the asymmetricMichaeladdition reaction of malonates to enones.
-amino acid into L-Leu-based heptapeptides preferentially induced right-handed (P) helical structures. Using 5∼20 mol % of a single helical foldamers-catalyst, enantioselective 1,4-addition reactions of dialkyl malonates to cycloalk-2-enones (5∼7 rings) proceeded to give chiral 3-substituted cycloalkanones with 94∼99% ee in moderate chemical yields, regardless of the ring size of substrates.