204447-94-9Relevant academic research and scientific papers
Biocatalytic access to nonracemic γ-oxo esters: Via stereoselective reduction using ene-reductases
Turrini, Nikolaus G.,Cioc, Rǎzvan C.,Van Der Niet, Daan J. H.,Ruijter, Eelco,Orru, Romano V. A.,Hall, Mélanie,Faber, Kurt
, p. 511 - 518 (2017/08/14)
The asymmetric bioreduction of α,β-unsaturated γ-keto esters using ene-reductases from the Old Yellow Enzyme family proceeds with excellent stereoselectivity and high conversion levels, covering a broad range of acyclic and cyclic derivatives. Various strategies were employed to provide access to both enantiomers, which are versatile precursors of bioactive molecules. The regioselectivity of hydride addition on di-activated alkenes was elucidated by isotopic labeling experiments and showed strong preference for the keto moiety as activating/binding group as opposed to the ester. Finally, chemoenzymatic synthesis of (R)-2-(2-oxocyclohexyl)acetic acid was achieved in high ee on a preparative scale combining enzymatic reduction followed by ester hydrogenolysis.
Enantioselective copper-catalyzed cyclopropanation of silyl enol ethers
Ebinger, Alexander,Heinz, Thomas,Umbricht, Gisela,Pfaltz, Andreas
, p. 10469 - 10480 (2007/10/03)
Copper(I) complexes derived from semicorrins, azasemicorrins and bisoxazolines are efficient catalysts for the enantioselective cyclopropanation of silyl enol ethers with diazoacetates. The resulting cyclopropanes can be converted to γ-ketocarboxylates by
