A one-pot reaction sequence has been developed which converts secondary alcohols to esters via oxidation to the carbonyl compound and concomitant Baeyer-Villiger reaction. This procedure employs meta-chloroperoxybenzoic acid (mCPBA) as the primary oxidant in both steps and a catalytic amount of a cyclic Cr(VI) ester as a co-oxidant in the initial step. Isolated yields are typically very high and chromatographic purification of the crude product is often unnecessary for routine operations.
physiological role) has long remained unexplored. In this study, we demonstrate the atypical in vitro activity of human FMO5 as a Baeyer–Villiger mono-oxygenase on a broad range of substrates, revealing the first example to date of a human protein catalyzing such reactions. The isolated and purified protein was active on diverse carbonyl compounds, whereas soft nucleophiles were mostly non- or poorly
Microbial Baeyer–Villiger oxidation of terpenones by recombinant whole-cell biocatalysts—formation of enantiocomplementary regioisomeric lactones
作者:Petra Černuchová、Marko D. Mihovilovic
DOI:10.1039/b703175k
日期:——
Recombinant whole-cell expression systems for BaeyerâVilliger monooxygenases of various bacterial origin were utilized in the regiodivergent biooxidation of cyclic terpenones enabling access to enantio- and regioisomeric lactones on preparative scale.
The ability of horseliveralcoholdehydrogenase (HLADH) to the enantioselective oxidation of primary–primary, primary–secondary and primary-tertiary aliphatic 1,5- and 1,6-diols 1a–i was studied. No enantioselectivity of the transformations of primary–primary 1,6-diols 1a–d to ɛ-lactones 4a–d was observed. Regioselective oxidation of primary–secondary 1,6-diols 1e,f and 1,5-diols 1h,i afforded enantiomerically
First chemo-enzymatic synthesis of the (R)-Taniguchi lactone and substrate profiles of CAMO and OTEMO, two new Baeyer–Villiger monooxygenases
作者:Florian Rudroff、Michael J. Fink、Ramana Pydi、Uwe T. Bornscheuer、Marko D. Mihovilovic
DOI:10.1007/s00706-016-1873-9
日期:2017.1
terpenones and bicyclic ketones, as well as kinetic resolution of racemic cycloketones. We demonstrated the applicability of the title enzymes in the enantioselective synthesis of (R)-(-)-Taniguchi lactone, a buildingblock for the preparation of various natural product analogs such as ent-quinine. GRAPHICAL ABSTRACT:
Microbiological transformations. 23. A surprising regioselectivity of microbiological Baeyer-Villiger oxidations of menthone and dihydrocarvone
作者:Véronique Alphand、Roland Furstoss
DOI:10.1016/s0957-4166(00)80281-5
日期:1992.1
Regioisomeric lactones (ee98%) were obtained by microbiological Baeyer-Villiger oxidation of enantiomers of menthone and dihydrocarvone. The regioselectivity of the biotransformation is shown to be dependant upon the considered enantiomer. An improvement of our empirical model of the active site is suggested.