Highly coordinate organosilicon compounds in synthesis: New entry to S,N-acetals by selective reduction of alkylthiomethyleniminium salts by use of trimethoxysilane and dilithium 2,3-butandiolate
Reduction of alkylthiomerthyleniminium iodides proceeds smoothly by use of trimethoxysilane and dilithium 2,3-butandiolate in tetrahydrofuran at 0°C to give the corresponding S,N-acetals selectively in high yield.
Benzazoles (benzoxazoles, benzothiazoles, and benzimidazoles) were efficiently prepared by the aquatic reaction of the corresponding thioamidinium salts and 2-aminophenol, 2-aminothiophenol, and 1,2-diaminobenzene, respectively. The thioamidinium salt was successfully applied as an alternative to a carboxylic acid derivative to react smoothly with an amino precursor and in the presence of catalytic
1,5-Dihydro-1,2,3,4-thia(S IV )triazoles from quaternary salts of NN-disubstituted thioamides and sodium azide
作者:Susan I. Mathew、Frank Stansfield
DOI:10.1039/p19740000540
日期:——
Quaternarysalts [e.g.(I)] of disubstituted thioamides react with aqueous sodium azide at room temperature giving high yields of products which are probably 1,5,5-trisubstituted 1,5-dihydro-1,2,3,4-thia(SIV)triazoles [e.g.(III)]. These are decomposed by dilute acids with loss of nitrogen giving amidines [e.g.(VII)] and thiosulphinic S-esters [e.g.(VIII)]. When the thiatriazole (III) is heated in solution
One-step synthesis of imidazo[1,2-a]pyridines in water
作者:H. Zali-Boeini、N. Norastehfar、H. Amiri Rudbari
DOI:10.1039/c6ra17065j
日期:——
A novel straightforward method for the synthesis of 2,3-disubstituted imidazo[1,2-a]pyridine derivatives in water as a truly safe and cheap reaction medium was developed. Hence, N-alkyl pyridinium and S-alkyl thiouronium salts were reacted in the presence of NaHCO3 as a mild base in water to produce imidazo[1,2-a]pyridines in moderate to excellent yields.
开发了一种新颖的直接方法,用于在水中合成2,3-二取代的咪唑并[1,2- a ]吡啶衍生物,将其作为一种真正安全且廉价的反应介质。因此,使N-烷基吡啶鎓盐和S-烷基硫代铀盐在水中作为弱碱的NaHCO 3存在下反应,以中等至优异的产率生产咪唑并[1,2- a ]吡啶。
Stansfield, Frank, Journal of the Chemical Society. Perkin transactions I, 1984, # 12, p. 2933 - 2935