Recyclization of enaminocarbonyl and enaminothiocarbonyl imidazolidine and pyrroline derivatives
摘要:
It was shown that recyclization of enaminocarbonyl compounds in acid media affords pyrrolinone derivatives. 2-Methylthio-4-oxopyrroline-1-oxide reacts with NaBH4 exclusively at the carbonyl group - and with methylmagnesium iodide, at the nitrone group - with substitution of the methylthiol group for a methyl group.
Transformations of conjugated enamines of the imidazolidine 1-oxide series in the Vilsmeier-Haack reaction
作者:Ch. S. Becker、G. I. Roshchupkina、T. V. Rybalova、Yu. V. Gatilov、V. A. Reznikov
DOI:10.1007/s11172-007-0183-0
日期:2007.6
In some cases, the reactions of enaminones of the imidazolidine 1-oxide series with the Vilsmeier reagent afford electrophilic substitution products containing the dimethyl-aminomethylene group. In an acidic medium, these products undergo either hydrolytic elimination of the dimethylaminomethylene moiety or hydrolysis of the latter to form the aldehyde group. The reaction of nitroenamine, which is