An α-acetoxy ketone reducing enzyme has been purified and characterized from the cell-free extract of bakers’ yeast (Saccharomyces cerevisiae). Only one NADPH-dependent dehydrogenase that catalyzed the reduction of α-acetoxy ketone was found in bakers’ yeast. The molecular weight of the enzyme was estimated to be 36 kDa by SDS-polyacrylamide gel electrophoresis. The enzyme was composed of a single
β-oxopropyl formate as a formylating agent of sterols
作者:Ahmed Kabouche、Zahia Kabouche
DOI:10.1016/s0040-4039(99)00155-0
日期:1999.3
Propargylic alcohol reacts with formic acid in the presence of mononuclear catalysts of ruthenium to selectively afford β-oxopropyl formate which has been shown as an exellent mild formylatingagent of sterols when the reaction is catalyzed by 1,5-di azabicyclo[4.3.0]non-5-ene (DBN).
of 1,n-dicarbonyl compounds through the homolytic C–C bond cleavage of unstrained carbocyclic and heterocyclic ring systems. This method exhibits a lot of synthetic advantages including mild conditions, simple operation, and convenience of amplification. Mechanistic studies support the generation of peroxy radical species via oxygen capture followed by radical fragmentation.