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–Villigeroxidation of cyclobutanones is achieved in current developed protocol with 10-methylacridinium perchlorate (AcrH+ClO4−) as a novel organocatalyst both with irradiation at room temperature and without irradiation at elevated temperature. Excellent yields of the corresponding lactones are obtained and the possible mechanism has been proposed.
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
A one-potchemoenzymatic method has been described for the synthesis of γ-butyrolactones starting from the corresponding ketones through a Baeyer–Villiger reaction. The approach is based on a lipase-catalyzed perhydrolysis for the formation of peracetic acid, which is the responsible for the ketone oxidation. Optimization studies have been performed in the oxidation of cyclobutanone, finding Candida
Catalytic C–C Cleavage/Alkyne–Carbonyl Metathesis Sequence of Cyclobutanones
作者:Jiqiang Gao、Chunhui Liu、Zhongjuan Li、Haotian Liang、Yuhui Ao、Jinbo Zhao、Yuchao Wang、Yuanqi Wu、Yu Liu
DOI:10.1021/acs.orglett.0c01317
日期:2020.5.15
substrates decorated with various substituents at different positions were all well accommodated. Preliminary mechanistic studies show that silver salt acted as a Lewis acid to facilitate both C-C cleavage of the cyclobutanone moiety and the subsequent metathesis between C═O and C≡C bonds.