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
Assessing the Substrate Selectivities and Enantioselectivities of Eight Novel Baeyer−Villiger Monooxygenases toward Alkyl-Substituted Cyclohexanones
作者:Brian G. Kyte、Pierre Rouvière、Qiong Cheng、Jon D. Stewart
DOI:10.1021/jo030253l
日期:2004.1.1
4-alkyl-substituted cyclohexanones tested, enzymes were discovered that afforded each of the corresponding (S)-lactones in ≥98% ee. This was also true for the 2-alkyl-substituted cyclohexanones examined. The situation was more complex for 3-akyl-substituted cyclohexanones. In a few cases, single Baeyer−Villiger monooxygenases possessed both high regio- and enantioselectivities toward these compounds
Single mutation of a “second sphere” residue of CHMOs could control its enantio- and regiopreference optionally.
单个CHMOs的“第二球”残基的突变可以选择性地控制其对映选择性和位置选择性。
Catalytic Asymmetric Baeyer-Villiger Oxidation in Water by Using Pt<sup>II</sup>Catalysts and Hydrogen Peroxide: Supramolecular Control of Enantioselectivity
chiral cyclobutanones 7 and 10: with 7 the best catalyst was 1 g, whereas with the larger substrate, 10, complexes 1 a–b performed better in terms of enantioselectivity. Each combination of substrate, catalyst and surfactant is a new system and supramolecular reciprocal interactions together with the hydrophobic character of the counterparts play crucial roles. The asymmetricBaeyer–Villiger oxidation
Chemo-enzymatic Baeyer–Villiger oxidation of 4-methylcyclohexanone via kinetic resolution of racemic carboxylic acids: direct access to enantioenriched lactone
作者:Agnieszka Drożdż、Anna Chrobok
DOI:10.1039/c5cc08519e
日期:——
A new method for the asymmetric chemo-enzymatic Baeyer-Villiger oxidation of prochiral 4-methylcyclohexanone to (R)-4-methylcaprolactone in the presence of (+/-)-4-methyloctanoic acid, Candida Antarctica lipase B and 30% aq. H2O2 has been...