Reactions of CF3-substituted boranes with α-diazocarbonyl compounds
摘要:
Boranes substituted with a CF3-group can be generated from methyl boronic esters RB(OMe)(2) and Me3SiCF3/KF followed by treatment with Me3SiCl. These boranes are stable only in coordinating solvents, and due to the increased Lewis acidity of boron, react rapidly with alpha-diazocarbonyl compounds to give the products of transfer of the organic group from boron. Alkyl, aryl, vinyl, and alkynyl boronic esters can be used in this reaction. (C) 2011 Elsevier Ltd. All rights reserved,
Oxidation of diazo compounds by triphenyl phosphite ozonide. Quenching of singlet oxygen by diazo compounds
作者:V. V. Shereshovets、N. M. Korotaeva、A. S. Vorob'ev、V. D. Komissarov、I. I. Furlei
DOI:10.1007/bf00697131
日期:1994.9
The reaction of triphenyl phosphite ozonide with various types of diazo compounds results in their oxidation, which is accomplished by singletoxygen (1O2) evolved during thermal decomposition of the ozonide. A decrease in the ionization potential of the substrate results in an increase in the overall rate constant of quenching of1O2. In the case of 9-diazofluorene, the main channel of1O2 quenching
A simple and efficient method to obtain α-xanthylmethyl ketones from α-diazo ketones is described. The reaction proceeds through a protonation/nucleophilic substitution sequence in the presence of p-toluenesulfonic acid and potassium ethyl xanthogenate as the nucleophile. As α-diazo ketones can be readily synthesized from ubiquitous carboxylic acids, a broad variety of xanthates can be obtained, including
Wolff rearrangement of (1-diazo-2-oxoalkyl) silanes
作者:Ralf Brückmann、Klaus Schneider、Gerhard Maas
DOI:10.1016/s0040-4020(01)89498-9
日期:1989.1
(1-diazo-2-oxoalkyl) silanes 6a-1 results in Wolffrearrangement yielding silyl ketenes 8a-1. From (1-diazo-3,3-dimethyl-2-oxobutyl) silanes 6c-f, 2-silyl-cyclobutanones 9c-f are formed as by-products, arising from intramolecular C/H insertion of the acyl carbene intermediate. Irradiation of diazo-triisopropylsilyl-acetamide 6m yields only β-lactam 16 and γ-lactam 17. Wolffrearrangement also takes place on copper triflate
Cycloaddition of diazoketones to [60]fullerene in the presence of the catalytic system Pd(acac)2—PPh3—Et3Al
作者:A. R. Tuktarov、A. R. Akhmetov、L. M. Khalilov、U. M. Dzhemilev
DOI:10.1007/s11172-010-0124-1
日期:2010.3
A method for the selective and efficient synthesis of methanofullerenes by cycloaddition of diazoketones to [60]fullerene in the presence of a three-component catalytic system Pd(acac)2—PPh3—Et3Al has been developed.
A novel method for the preparation of α-oso-aldehydes by dimethyl dioxirane oxidation of α-diazoketones is described. The procedure is particularly useful when the desired compound cannot be purified by chromatography or distillation: the by-products (acetone and nitrogen) can be evaporated and the reaction crude consists only of the pure compound.