Expanding the scope of enzymatic carboligation reactions in flow-mode: production of optically active tertiary alcohols with packed-bed micro-bioreactors
作者:P. P. Giovannini、O. Bortolini、A. Cavazzini、R. Greco、G. Fantin、A. Massi
DOI:10.1039/c4gc00838c
日期:——
Acetylacetoin synthase (AAS) from Bacillus licheniformis has been partially purified and immobilized on a silica support and its activity was tested under batch conditions in the homo-coupling of a set of α-diketones leading to valuable α-hydroxy ketone derivatives displaying a chiral tertiary alcohol functionality at the α-position. Next, the effectiveness of AAS heterogeneous catalysis has been evaluated
Enzymatic diastereo- and enantioselective synthesis of α-alkyl-α,β-dihydroxyketones
作者:Pier Paolo Giovannini、Giancarlo Fantin、Alessandro Massi、Valentina Venturi、Paola Pedrini
DOI:10.1039/c1ob05928a
日期:——
reactions of α-diketones catalyzed by acetylacetoin synthase (AAS) produce a set of α-alkyl-α-hydroxy-β-diketones (30–60%, ee 67–90%), which in turn are reduced regio-, diastereo-, and enantioselectively to the corresponding chiral α-alkyl-α,β-dihydroxyketones (60–70%, ee >95%) using acetylacetoin reductase (AAR) as catalyst. Both enzymes are obtained from Bacillus licheniformis and used in a crude form. The