Three-component cyclocondensations. Two methods for the efficient preparation of 5-aminothiazolium salts via the reaction of isocyanides either with dimethylthioformamide and imino chloro sulfides or benzaldimines and aryl chlorothioformates
摘要:
Treatment of imino chloro sulfides with dimethylthioformamide and isocyanides at room temperature provides selectively the 5-amino-4-(dimethylamino)-2-(methylthio)(or phenylthio)thiazolium salts. Similarly, the reactions of p-tolyl chlorothionoformate and phenyl chlorodithioformate with a mixture of benzaldimine and isocyanide afford rapidly the 5-amino-4-phenylthiazolium salts. We suggest that these reactions involve the N-(thiocarbonyl)formamidinium and benzylideniminium chlorides as transient intermediates, which are trapped by isocyanides according to a [1 + 4] cycloaddition process. The structure of the thiazolium salts and some of their reactivities are discussed.
New imidoyl isothiocyanates. Chemical behavior in polar solvents. Reaction with sulfenyl thiocyanates: preparation of 1,2-dihydro-2-thioxo-1,3,5-triazines and 1,3,4,6,6a-triazadithia[6aS(IV)]pentalenes
Three-component cyclocondensations. An efficient synthesis of 4-amino-2-(methylthio)imidazolium salts via the reaction of methyl chlorothioimidates with benzaldimines and isocyanides. Autoxidation of the imidazole derivatives
作者:Yvelise Malvaut、Evelyne Marchand、Georges Morel
DOI:10.1021/jo00033a038
日期:1992.3
Treatment of imino chlorosulfides 1 with a mixture of benzaldimine and isocyanide provides 4-aminoimidazolium chlorides 5. Presumably this reaction involves the N-imidoylbenzylideniminium chlorides 4 as transient intermediates. 1- and 3-tert-Butyl imidazolium salts 5 undergo fast isobutene elimination giving the corresponding imidazole and imidazoline hydrochlorides 10 and 13. Compounds 13 autoxidize to afford 5-hydroxy derivatives 14 under atmospheric oxygen. The structural assignment of 14 has been confirmed by X-ray diffraction analysis. Under similar conditions, treatment of ketimines 17 with methyl chlorothioimidate 1 and isocyanide gives 2-thioxodiazolidines 19.
Reactions of protonated 1,3-diaza,-4,4-diphenyl-2-(methylthio)butadienes with isocyanides: preparation of imidazole and triazine derivatives
C-(Methoxycarbonyl)ketene N-imidoylimine synthesis and rearrangement into methyl 4,6-diazahepta-2,4,6-trienoates. Cycloaddition reactions with isocyanides: preparation of imidazolines
作者:Georges Morel、Evelyne Marchand、Andre Foucaud
DOI:10.1021/jo00206a009
日期:1985.3
Synthesis of thioimidates by insertion of TerT-butylisocyanide into the C-S bond of activated sulfides. Rearrangement of thioimidates by 1,3 C to N migration of an alkoxycarbonyl group
作者:G Morel、E Marchand、K.H Nguyen Thi、A Foucaud
DOI:10.1016/s0040-4020(01)91248-7
日期:1984.1
thioimidates can also be obtained via the chlorine substitution of the tert-butylimino chloro sulfides -, which is a more general method. These thioimidates rearrange to E and Z isomers of N-vinylcarbamates - via a 1,3 C to N migration of the alkoxycarbonyl group.