Alkene Syn Dihydroxylation with Malonoyl Peroxides
摘要:
Cyclopropyl malonoyl peroxide (1), which can be prepared in a single step from the commercially available diacid, is an effective reagent for the dihydroxylation of alkenes. Reaction of 1 with an alkene in the presence of 1 equiv of water at 40 degrees C followed by alkaline hydrolysis leads to the corresponding diol (40-93%). With 1,2-disubstituted alkenes, the reaction proceeds with syn selectivity (3:1 to > 50:1). A mechanism consistent with the experimental findings that is supported by oxygen-labeling studies is proposed.
C−O coupling of Malonyl Peroxides with Enol Ethers
<i>via</i>
[5+2] Cycloaddition: Non‐Rubottom Oxidation
作者:Vera A. Vil'、Evgenii S. Gorlov、Oleg V. Bityukov、Yana A. Barsegyan、Yulia E. Romanova、Valentina M. Merkulova、Alexander O. Terent'ev
DOI:10.1002/adsc.201900271
日期:2019.7.2
Malonyl peroxides act both as oxidants and reagents for C−O coupling in reactions with methyl and silyl enol ethers. In the proposed conditions, the oxidative C−O coupling of malonyl peroxides with enol ethers selectively proceeds, bypassing the traditional Rubottom hydroxylation of enol ethers by peroxides. It was observed that the oxidative [5+2] cycloaddition of malonyl peroxides and enol ethers
Alkene Dihydroxylation with Malonoyl Peroxides: Catalysis Using Fluorinated Alcohols
作者:Sylvain Picon、Michael Rawling、Matthew Campbell、Nicholas C. O. Tomkinson
DOI:10.1021/ol3030154
日期:2012.12.21
The effect of fluorinated alcohols on the dihydroxylation of alkenes using cyclopropyl malonoyl peroxide is described. Addition of perfluoro-tert-butyl alcohol to a toluene solution of alkene and peroxide increases the rate of product formation and the stereoselectivity observed, providing a simple and effective method for acceleration of this important class of reaction. Basic hydrolysis of the crude
Alkene <i>Syn</i>- and <i>Anti</i>-Oxyamination with Malonoyl Peroxides
作者:Jonathan M. Curle、Marina C. Perieteanu、Philip G. Humphreys、Alan R. Kennedy、Nicholas C. O. Tomkinson
DOI:10.1021/acs.orglett.0c00253
日期:2020.2.21
Malonoyl peroxide 6 is an effective reagent for the syn- or anti-oxyamination of alkenes. Reaction of 6 and an alkene in the presence of O-tert-butyl-N-tosylcarbamate (R3 = CO2tBu) leads to the anti-oxyaminated product in up to 99% yield. Use of O-methyl-N-tosyl carbamate (R3 = CO2Me) as the nitrogen nucleophile followed by treatment of the product with trifluoroacetic acid leads to the syn-oxyaminated
Alkene Dioxygenation with Malonoyl Peroxides: Synthesis of γ-Lactones, Isobenzofuranones, and Tetrahydrofurans
作者:Carla Alamillo-Ferrer、Marianna Karabourniotis-Sotti、Alan R. Kennedy、Matthew Campbell、Nicholas C. O. Tomkinson
DOI:10.1021/acs.orglett.6b01253
日期:2016.7.1
homoallylic alcohols or carboxylic acids with malonoyl peroxide 1 provides a stereoselective method for the preparation of tetrahydrofurans, γ-lactones, and isobenzofuranones in 44–82% yield and up to 27:1 trans selectivity. Application of this simple and effective heterocyclization in the synthesis of the antidepressant citalopram is also described.
Oxidative C–O coupling as a new idea in the ‘click-like chemistry’: malonyl peroxides for the conjugation of two molecules
作者:Vera A. Vil’、Evgenii S. Gorlov、Oleg V. Bityukov、Igor B. Krylov、Gennady I. Nikishin、Kasimir K. Pivnitsky、Alexander O. Terent’ev
DOI:10.1016/j.mencom.2019.03.003
日期:2019.3
Malonylperoxides were used for the one-pot construction of hybrid structures by conjugation of heterocycle (3H-pyrazol-3-one, isoxazol-5(2H)-one, pyrazolidine-3,5-dione, or barbituric acid) and amine or alcohol. The first stage represents oxidative C–O coupling with liberation of the carboxyl group which is functionalized at the second stage thus affording ‘clicklike’ products with malonic linker