N'-dioxide-Sc(III) complex catalysts. The BV oxidations of prochiral cyclohexanones and cyclobutanones afforded series of optically active ε- and γ-lactones, respectively, in up to 99% yield and 95% ee. Meanwhile, the kinetic resolution of racemic 2-arylcyclohexanones was also realized via an abnormal BV oxidation. Enantioenriched 3-aryloxepan-2-ones, whose formation is counter to the migratoryaptitude, were
Comparing the Stereoselective Biooxidation of Cyclobutanones by Recombinant Strains Expressing Bacterial Baeyer–Villiger Monooxygenases
作者:Florian Rudroff、Joanna Rydz、Freek H. Ogink、Michael Fink、Marko D. Mihovilovic
DOI:10.1002/adsc.200700072
日期:2007.6.4
cyclobutanone structural motif was investigated using a collection of eight monooxygenases of different bacterial origin. This platform of enzymes is able to perform stereoselective biotransformations on an array of structurally diverse substrates. With several ketone precursors, biooxidations yielded enantiocomplementary butyrolactones as key intermediates for the synthesis of natural products and bioactive compounds
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:
An Approach to β-Substituted γ-Butyrolactones and its Application to the Synthesis of Lignans
作者:Yuichi Kobayashi、Yuichi Isemori
DOI:10.1055/s-2004-830890
日期:——
4-arylmethyl-2-cyclopenten-1-ols regioselectively. Subsequent cleavage of the cyclopentene ring followed by functional group manipulation provided the key β-arylmethyl-γ-butyrolactones for the synthesis of lignans. In addition, synthesis of the rolipram lactone intermediate was accomplished.
Correction to Enantioselective Baeyer–Villiger Oxidation: Desymmetrization of Meso Cyclic Ketones and Kinetic Resolution of Racemic 2-Arylcyclohexanones