The mechanistic mode of oxidation of substituted n,n-dimethylanilines, thioanisoles, and methyl phenyl sulfoxides by 5-ethyl-4a-hydroperoxy-3-methyl-lumiflavin (4a-FlEt-OOH)
作者:Shigeru Oae、Kaoru Asada、Toshiaki Yoshimura
DOI:10.1016/s0040-4039(00)81631-7
日期:1983.1
In the oxidation of the title compounds, 5-ethyl-4a-hydroperoxy-3-methyl-lumiflavin (4a-FlEt-OOH), was found to be an electrophilic oxidant similar to m-chloroperoxybenzoic acid. However, the stereoselectivity of the oxidation of cyclic sulfides to the corresponding sulfoxides by 4a-FlEt-OOH was less pronounced than that of the oxygenation with flavin-containing monooxygenase.
Stereochemisty of oxygenation of organic sulphides with pig liver microsomal FAD-containing mono-oxygenase: comparison with cytochrome P-450PB oxidations
The enantiotopic differentiating ability of piglivermicrosomalFAD-containingmono-oxygenase (EC 1.14.13.8) in the oxygenation of nine unsymmetrical sulphides has been investigated. By this enzymatic oxygenation, the sulphides are converted into the corresponding optically active sulphoxides with varying degrees of enantiomeric excess (96–12%).
STEREOCHEMISTRY OF SULFOXIDES BY ENZYMATIC OXYGENATION OF SULFIDES WITH RABBIT LIVER MICROSOMAL CYTOCHROME P-450
作者:Toshikazu Takata、Mayumi Yamazaki、Ken Fujimori、Yong Hae Kim、Shigeru Oae、Takashi Iyanagi
DOI:10.1246/cl.1980.1441
日期:1980.11.5
Asymmetric induction and diastereomeric ratio in the enzymatic oxygenation of various sulfides to the corresponding sulfoxides with hepatic mirosomal cytochrome P-450 obtained from phenobarbital pretreated rabbit were investigated in comparison with those of nonenzymatic oxidation with m-chloroperbenzoic acid and sodium metaperiodate. While substantial asymmetric inductions were observed in the sulfoxides formed by the enzymattc oxygenations, diastereomeric ratios of the sutfoxides formed were also quite different from those obtained by oxidation with m-chloroperbenzoic acid and sodium metaperiodate.
Intermolecular Stereoselective Pummerer Reactions of 4-(<i>p</i>-Chlorophenyl)thiane 1-Oxides and<i>trans</i>-1-Thiadecalin 1-Oxides and 2-Thiadecalin 2-Oxides with Acetic Anhydride
18O-labeled sulfoxide revealed the reaction to be an intermolecular rearrangement, while the kinetic experiment with α-deuterated 4-(p-chlorophenyl)thiane 1-oxides gave sizable values of kinetic isotope effect, i.e., 2.8 for the cis isomer and 3.4 for the trans isomer. In the reaction of 4-arylthiane 1-oxides with acetic anhydride, the thermodynamically controlled product is axial 2-acetoxy-4-(p-chlorophenyl)thiane