1008-73-7Relevant academic research and scientific papers
An aerobic, organocatalytic, and chemoselective method for Baeyer-Villiger oxidation
Imada, Yasushi,Iida, Hiroki,Murahashi, Shun-Ichi,Naota, Takeshi
, p. 1704 - 1706 (2005)
(Chemical Equation Presented) Highly chemoselective Baeyer-Villiger oxidations can be performed in the presence of other reactive functionalities such as alcohols, olefins, and sulfides, which would undergo electrophilic oxidation under conventional conditions (see scheme). [DMRFlEt] +[ClO4]- (depicted blue) is a new class of flavin compound that catalyzes aerobic Baeyer-Villiger oxidations in the presence of Zn dust as the electron source.
Iridium-catalyzed enantioselective allylic alkylation of methyl 2-(4-nitrophenylsulfonyl)acetate and subsequent transformations
Xu, Qing-Long,Dai, Li-Xin,You, Shu-Li
, p. 2275 - 2282 (2012)
Highly enantioselective allylic alkylation reactions of methyl 2-(4-nitrophenylsulfonyl)acetate were carried out in the presence of an iridium catalytic system. The subsequent transformations of the products including reductive desulfonylation and modifie
Acetic Acid as a Highly Reactive and Easily Separable Catalyst for the Oxidative Cleavage of Tetrahydrofuran-2-methanols to γ-Lactones
Yakura, Takayuki,Fujiwara, Tomoya,Nishi, Hideyuki,Nishimura, Yushi,Nambu, Hisanori
, p. 2316 - 2320 (2018)
[4-Iodo-3-(isopropylcarbamoyl)phenoxy]acetic acid was developed as a highly reactive and easily separable catalyst for the oxidative cleavage of tetrahydrofuran-2-methanols to γ-lactones in the presence of Oxone (2KHSO 5 ·KHSO 4 ·K 2 SO 4) as the co-oxidant. The reactivity of this new catalyst was considerably greater than that of our previously reported catalyst, 2-iodo-N-isopropylbenzamide. The new catalyst and product were easily separated by only liquid-liquid separation without chromatography. In addition, using a mixture of nitromethane and N, N-dimethylformamide as the solvent and heating enabled a low catalyst loading, a short reaction time, and high product yield. Oxidative cleavage using the new catalyst can be used as a practical and efficient method for synthesizing γ-lactones.
Asymmetric Baeyer-Villiger oxidation with Co(Salen) and H2O 2 in water: Striking supramolecular micelles effect on catalysis
Bianchini, Giulio,Cavarzan, Alessandra,Scarso, Alessandro,Strukul, Giorgio
, p. 1517 - 1520 (2009)
A micellar environment enables catalytic, diastereoselective and enantioselective Baeyer-Villiger oxidation of cyclobutanones (ee up to 90%) with H2O2 as oxidant using Co(Salen) catalyst 1, while the same catalytic system is inactive in organic solvents. The Royal Society of Chemistry 2009.
Investigation of a New Type I Baeyer–Villiger Monooxygenase from Amycolatopsis thermoflava Revealed High Thermodynamic but Limited Kinetic Stability
Mansouri, Hamid R.,Mihovilovic, Marko D.,Rudroff, Florian
, p. 971 - 977 (2020)
Baeyer–Villiger monooxygenases (BVMOs) are remarkable biocatalysts, but, due to their low stability, their application in industry is hampered. Thus, there is a high demand to expand on the diversity and increase the stability of this class of enzyme. Sta
Design of peptide-containing: N 5-unmodified neutral flavins that catalyze aerobic oxygenations
Arakawa, Yukihiro,Yamanomoto, Ken,Kita, Hazuki,Minagawa, Keiji,Tanaka, Masami,Haraguchi, Naoki,Itsuno, Shinichi,Imada, Yasushi
, p. 5468 - 5475 (2017)
Simulation of the monooxygenation function of flavoenzyme (Fl-Enz) has been long-studied with N5-modified cationic flavins (FlEt+), but never with N5-unmodified neutral flavins (Fl) despite the fact that Fl is genuinely equal to the active center of Fl-Enz. This is because of the greater lability of 4a-hydroperoxy adduct of Fl, FlOOH, compared to those of FlEt+, FlEtOOH, and Fl-Enz, FlOOH-Enz. In this study, Fl incorporated into a short peptide, flavopeptide (Fl-Pep), was designed by a rational top-down approach using a computational method, which could stabilize the corresponding 4a-hydroperoxy adduct (FlOOH-Pep) through intramolecular hydrogen bonds. We report catalytic chemoselective sulfoxidation as well as Baeyer-Villiger oxidation by means of Fl-Pep under light-shielding and aerobic conditions, which are the first Fl-Enz-mimetic aerobic oxygenation reactions catalyzed by Fl under non-enzymatic conditions.
Silyl peroxides as effective oxidants in the Baeyer-Villiger reaction with chloroaluminate(III) ionic liquids as catalysts
Baj, Stefan,S?upska, Roksana,Chrobok, Anna,Drozdz, Agnieszka
, p. 120 - 126 (2013)
A new application of silyl peroxides as oxidants in the Baeyer-Villiger oxidation of cyclic ketones in chloroaluminate(III) ionic liquids is described. Among the silyl peroxides, the reactivity of two groups of peroxides was studied: bis(silyl) and t-butyl silyl peroxides possessing different structured substituents attached to the Si atom. It was shown that the acidic 1-hexyl-3-methylimidazolium chloroaluminate(III) ionic liquid (molar ratio of AlCl3 in ionic liquid: 0.67) present in the oxidation of cyclic ketones with bis(silyl) peroxides acts as the catalyst. In this variant of the reaction, the reactivities of bis(silyl) peroxides decrease in the following order: bis(trimethylsilyl) peroxide > bis(vinyldimethylsilyl) peroxide > bis(phenyldimethylsilyl) peroxide > bis(diphenylmethylsilyl) peroxide. A variety of cyclic ketones such as cyclobutanone, 3-substituted cyclobutanones, cyclopentanone, cyclohexanone, 2-methylcyclohexanone, 4-methylcyclohexanone, 2-adamantanone and norcamphor were oxidised to their corresponding lactones with high yields (49-100%). When t-butyl silyl peroxides and neutral chloroaluminate(III) ionic liquids (molar ratio of AlCl3 in ionic liquid: 0.5) were utilised in the Baeyer-Villiger oxidation, the studied ionic liquid acted as the reagent. Here, phenyldimethyl(t-butylperoxy)silane was the most efficient oxidant in the oxidation of cyclobutanone to γ- butyrolactone (70% yield). Other peroxides, including trimethyl(t-butylperoxy) silane, vinyldimethyl(t-butylperoxy)silane and diphenylmethyl-(t-butylperoxy) silane, were less reactive oxidants. Two variants of the Baeyer-Villiger reaction mechanism are postulated.
Dehydrogenative lactonization of diols in aqueous media catalyzed by a water-soluble iridium complex bearing a functional bipyridine ligand
Fujita, Ken-Ichi,Ito, Wataru,Yamaguchi, Ryohei
, p. 109 - 112 (2014)
A new catalytic system for the dehydrogenative lactonization of a variety of benzylic and aliphatic diols in aqueous media was developed. By using a water-soluble, dicationic iridium catalyst bearing 6,6′-dihydroxy-2, 2′-bipyridine as a functional ligand, highly atom economical and environmentally benign synthesis of various lactones was achieved in good to excellent yields. Recovery and reuse of the catalyst were also accomplished by a simple phase separation and the recovered catalyst maintained its high activity at least until the fifth run. Copyright
Asymmetric Baeyer-Villiger oxidation of prochiral cyclobutanones using a chiral cationic palladium(II) 2-(phosphinophenyl)pyridine complex as catalyst
Ito, Katsuji,Ishii, Ayako,Kuroda, Tomomi,Katsuki, Tsutomu
, p. 643 - 646 (2003)
Chiral cationic palladium(II) 2-(phosphinophenyl)pyridine (1a) complex was found to be an effective catalyst for asymmetric Baeyer-Villiger oxidation of prochiral cyclobutanones. For example, good and excellent enantioselectivities (80% and >99% ees) were
CATALYTIC REGIOSELECTIVE DEHYDROGENATION OF UNSYMMETRICAL α,ω-DIOLS USING RUTHENIUM COMPLEXES
Ishii, Youichi,Osakada, Kohtaro,Ikariya, Takao,Saburi, Masahiko,Yoshikawa, Sadao
, p. 2677 - 2680 (1983)
Ruthenium complex catalyzed regioselective dehydrogenation of unsymmetrically substituted 1,4- and 1,5-diols in the presence of α,β-unsaturated ketone as a hydrogen acceptor and triethylamine gave β-substituted γ-lactones and γ-substituted δ-lactones as major products, respectively.
