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Cyclic enamines radical reactions

Anodic regioselective acetamidosulfeny-lation of alkenes is similarly achieved by oxidation of diphenyldisulfide in acetonitrile [81]. Cyclic enamines, which are intermediates in the oxidation of cyclic N-methoxycarbonyl amines, react in aqueous acetonitrile that contains chloride ions to a-hydroxy- 8-chloro compounds via intermediate chloronium ions [82]. Enolethers undergo a regioselective azidomethoxyla-tion to yield acetals of a-azido carbonyl compounds upon electrolysis in methanol containing sodium azide [83]. The reaction proceeds possibly via addition of an anodicaUy generated azide radical. [Pg.408]

Cyclic enamines, ynamines and ureas, preparative methods 86MI12. Design of free radical reactions for the synthesis of heterocycles 88S417, 88S489. [Pg.43]

Guertler et al. (1996) described a wide range of cycloaddition reaction between 2-vinyl indoles acting as heterodienes and cyclic or acyclic enamines bearing acceptor groups in (3 positions. The reaction was induced by the formation of 2-vinylindole cation-radicals through anodic oxidation. The synthesis of 4a-carbomethoxy-6-cyano-5,7-dimethylindolo[l,2-a]-l,2,3,4,4a,12a-hexahydro-1,8-naphthyridine can serve as an example (Scheme 7.24). [Pg.366]

From an electrochemical reduction of some cyclic immonium salts of the type N-cyclohexylidenepyrrolidinium fluoborate in aprotic media, the enamine and the saturated tertiary amine were the major products [42]. It was suggested that the reaction was a one-electron transfer followed by a rate-determining radical-radical disporportionation involving hydrogen atom transfer. [Pg.439]

On the basis of the cyclic voltammetry (CV) results, DFT calculations, and control experiments, the reaction mechanism involving the cationic radical enamine was proposed. [Pg.85]


See other pages where Cyclic enamines radical reactions is mentioned: [Pg.880]    [Pg.507]    [Pg.880]    [Pg.46]    [Pg.509]    [Pg.365]    [Pg.136]   
See also in sourсe #XX -- [ Pg.880 , Pg.881 ]

See also in sourсe #XX -- [ Pg.880 , Pg.881 ]




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Cyclic reactions

Enamine reaction

Enamines cyclic—

Radical cyclication

Radicals enamine

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