Oxidation of α-iodo ketone in CH 2 Cl 2 using m-chloroperbenzoic acid yields α,β-unsaturatedketone by β-H elimination in good yield. This reaction affords a new and convenient synthetic method for α,β-unsaturatedketone from u-iodo ketone.
Irradiation of α-iodo ketone in hexane under a nitrogen atmosphere with a high-pressure mercury lamp (λ>300nm) at room temperature afforded the corresponding α,β-unsaturatedketones in good yield. This reaction affords a new, clean and convenient synthetic method for the α,β-unsaturatedketone.
Oxidation of 2-Substituted Cycloalkanones with Cerium(IV) Sulfate Tetrahydrate in Alcohols and Acetic Acid
作者:Liangyou He、C. Akira Horiuchi
DOI:10.1246/bcsj.72.2515
日期:1999.11
The reaction of 2-substituted cycloalkanones with cerium(IV) sulfate tetrahydrate (CS) in alcohols and acetic acid gave the corresponding alkyl esters of oxo acids (80—96%) and oxo acids (78—96%), respectively, by oxidative cleavage of the C(R)–C=O bond. In the case of 2-iodocycloalkanones in methanol, the dimethyl ester was obtained in good yield. A treatment of 5α-cholestan-3-one with CS in methanol
Unexpected nucleophilic behaviour of free-radicals generated from α-iodoketones
作者:Corinne De Dobbeleer、Jiří Pospíšil、Freija De Vleeschouwer、Frank De Proft、István E. Markó
DOI:10.1039/b901943j
日期:——
The unexpected nucleophilic reactivity of free-radicals generated from α-iodoketones is reported; two different procedures, either employing tin or the more environmentally acceptable ethylsulfone-based coupling reagent 5c have been developed.
Reaction of Enol Ethers with the I2-H2O2 System: Synthesis of 2-Iodo-1-methoxy Hydroperoxides and Their Deperoxidation and Demethoxylation to 2-Iodo Ketones
The reaction of enol ethers with the I2-H2O2 system in diethyl ether affords 2-iodo ketones and the previously unknown 2-iodo-1-methoxy hydroperoxides. In the presence of the I2-H2O2 system, the latter compounds undergo deperoxidation and demethoxylation to form 2-iodo ketones. The reaction conditions were found for the synthesis of 2-iodo ketones from enol ethers in 67-94% yields.