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.
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.
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
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
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.