Different pathways in the reaction of N-(tosylmethyl)-substituted ureas, thioureas, and N′-cyanoguanidines with sodium cyanide. Synthesis of α-ureido nitriles, α-ureido amides, and hydantoin imino derivatives
作者:Anastasia A. Fesenko、Anatoly D. Shutalev
DOI:10.1016/j.tet.2020.131340
日期:2020.10
Reaction of N-(tosylmethyl)-substituted ureas, thioureas, and N′-cyanoguanidines, prepared by condensation of the corresponding amides with various aldehydes and p-toluenesulfinic acid, with NaCN has been studied. The outcome of the reaction is strongly dependent on the amide nature and reaction conditions. Generally, N-(tosylmethyl)ureas afford α-ureido nitriles, N-(tosylmethyl)-N′-cyanoguanidines
研究了通过相应的酰胺与各种醛和对甲苯亚磺酸缩合制备的N-(甲苯磺酰基甲基)取代的脲,硫脲和N'-氰基胍与NaCN的反应。反应的结果在很大程度上取决于酰胺的性质和反应条件。通常,Ñ - (甲苯磺酰基甲基)脲,得到α -脲基腈,ñ - (甲苯磺酰基甲基) - N' -cyanoguanidines转变成4-氨基-2-氰基亚-1,5-二氢-2 ħ -咪唑,和Ñ-(甲苯磺酰基甲基)硫脲得到各种咪唑衍生物的复杂混合物。通过用浓溶液处理将制备的α-脲基腈选择性地转化为相应的α-脲基酰胺。在室温下为HCl。在碱性条件下,α-脲基腈环化成4-氨基-1,5-二氢-2 H-咪唑-2-酮。用浓溶液处理4-氨基-2-氰基亚氨基-1,5-二氢-2 H-咪唑。室温下的HCl导致hydrolysis片段和氰基水解,得到2-(氨基甲酰亚氨基)咪唑啉-4-酮的盐酸盐,其易于被氨基甲酰化而形成2-亚氨基咪唑啉-4-酮的盐酸盐