Enantioselective Baeyer–Villiger Oxidation Catalyzed by Palladium(II) Complexes with Chiral <i>P,N</i>-Ligands
作者:Andrei V. Malkov、Frédéric Friscourt、Mark Bell、Martin E. Swarbrick、Pavel Kočovský
DOI:10.1021/jo800246g
日期:2008.6.1
Asymmetric Baeyer–Villiger reaction of symmetrical cyclobutanones 1a−j with urea−hydrogen peroxide (UHP) can be catalyzed by a complex of Pd(II) and the new terpene-derived P,N-ligand 7. The resulting lactones 2a−j were obtained in high yields and with good enantioselectivity (≤81% ee).
Baeyer–Villiger monooxygenase-catalyzed desymmetrizations of cyclobutanones. Application to the synthesis of valuable spirolactones
作者:María Rodríguez-Mata、Iván Lavandera、Vicente Gotor-Fernández、Vicente Gotor、Susana García-Cerrada、Javier Mendiola、Óscar de Frutos、Iván Collado
DOI:10.1016/j.tet.2015.12.071
日期:2016.11
A series of γ-butyrolactone derivatives, including some spiranic ones, was obtained through desymmetrization of the corresponding prochiral 3-substituted cyclobutanones via Baeyer–Villiger monooxygenase (BVMO)-catalyzed oxidation. After reaction optimization using several commercial enzymes, both antipodes of various lactones were synthesized in most cases with >90% conversion and >80% enantiomeric
for enantioselective Baeyer–Villiger (B–V) oxidation of prochiral cyclobutanones. Among the prepared catalysts, the supported ones showed better enantioselectivity, good thermal stability and negligible loss of activity over consecutive recycling offset by lower chemical yield. We report here an efficient method for asymmetricBaeyer–Villigeroxidation of prochiral cyclobutanones using new polymer-supported
Asymmetric Baeyer-Villiger reaction: Diastereodifferentiating peracid oxidation of chiral acetal in the presence of Lewis acid
作者:Takashi Sugimura、Yoshihisa Fujiwara、Akira Tai
DOI:10.1016/s0040-4039(97)01338-5
日期:1997.8
Oxidation of 2 with m-chloroperbenzoic acid in the presence of SnCl4 at −78 °C followed by hydrolysis afforded opticallyactive 4 in a quantitative yield. The enantiomeric excess (ee) of 4 largely depended on the reaction solvent, the chiral diol part, the Lewis acid and its amount. The best ee was 89% when 2 (R = Ph) having 2,4-pentanediol was oxidized at −100 °C.
In Tandem Auto‐Sustainable Enantioselective Heck‐Matsuda Reactions Directly from Anilines
作者:Christian Leonardo Herrera、João Victor Santiago、Julio Cezar Pastre、Carlos Roque Duarte Correia
DOI:10.1002/adsc.202200205
日期:2022.6.7
An in tandem enantioselective Heck-Matsuda (HM) reaction of cyclic and acyclic olefins directly from anilines is described. The method relies on a process involving the progressive in situ diazotization of the starting anilines followed by a palladium-catalyzed Heck-Matsuda arylation using chiral N,N-ligands. This intermolecular enantioselective HM arylation strategy was applied to the desymmetrization