Extensive substrate profiling of cyclopentadecanone monooxygenase as Baeyer–Villiger biocatalyst reveals novel regiodivergent oxidations
摘要:
Cyclopentadecanone monooxygenase (CPDMO) is one of the latest additions to the established library of Baeyer-Villiger monooxygenases. Desymmetrizations of substituted cyclobutanones and -hexanones as well as kinetic resolutions of racemic cycloketones are efficiently catalyzed by CPDMO. Moreover the enzyme shows unprecedented preference in regiodivergent oxidations of terpenones and the bicyclic Geissman-Waiss lactone precursor giving access to the optical antipode of retronecine and other pyrrolizidine alkaloids. (C) 2011 Elsevier B.V. All rights reserved.
.alpha.-Halo sulfones. XXI. Bishomoconjugative rearrangement pathway. Structural bond relocation attending the dehydrohalogenation of unsaturated cyclic .alpha.-halo ketones and sulfones
The geometrical constraints of the fluoride-initiated and Lewis acid-catalyzed intramolecular addition of allylsilanes to enone systems were shown to be governed by kinetic-ring-size preferences. Molecules containing adjacent quaternary carbon atoms can be prepared using this method.