Semicarbazones from N-Hydroxyureas and Amines: A Novel Entry in the Reactivity of the Acyl Nitroso Group
摘要:
The condensation of carbamoyl nitroso compounds, obtained by oxidation of N-hydroxyureas, with amines unexpectedly afforded semicarbazones (aka carbamoyl hydrazones). Although the substitution of the nitrosyl moiety might compete to afford the corresponding urea, an excess of amine led to the semicarbazone as the major product, which is presumably formed via isomerization of an initially generated acyl azo compound.
氨基甲酰基化剂氨基甲酰基叠氮化物和氨基甲酰基氰化物(又名氰基甲酰胺)以不同的方式与羟胺反应,在第一种情况下生成N-羟基脲,在氨基甲酰基氰化物的情况下,生成氨基甲酰基a肟肟衍生物。为后一种类型的化合物开发的合成方法代表了杂环结构的一种有趣的前体,可以高效地制备各种实例。在比较异丙基和苄基衍生物的实验值和计算出的13 C和15 N NMR化学位移值的基础上,提出了mid胺肟部分中双键的Z构型。
The carbamoylating agents carbamoylazides and carbamoyl cyanides (aka cyanoformamides) react with hydroxylamine in different ways, leading in the first case to N-hydroxyureas and, in the case of carbamoyl cyanides, to carbamoyl amidoxime derivatives. The synthetic procedure developed for the latter type of compound, which represents an interesting precursor for heterocyclic structures, allowed the
氨基甲酰基化剂氨基甲酰基叠氮化物和氨基甲酰基氰化物(又名氰基甲酰胺)以不同的方式与羟胺反应,在第一种情况下生成N-羟基脲,在氨基甲酰基氰化物的情况下,生成氨基甲酰基a肟肟衍生物。为后一种类型的化合物开发的合成方法代表了杂环结构的一种有趣的前体,可以高效地制备各种实例。在比较异丙基和苄基衍生物的实验值和计算出的13 C和15 N NMR化学位移值的基础上,提出了mid胺肟部分中双键的Z构型。
Semicarbazones from <i>N</i>-Hydroxyureas and Amines: A Novel Entry in the Reactivity of the Acyl Nitroso Group
The condensation of carbamoyl nitroso compounds, obtained by oxidation of N-hydroxyureas, with amines unexpectedly afforded semicarbazones (aka carbamoyl hydrazones). Although the substitution of the nitrosyl moiety might compete to afford the corresponding urea, an excess of amine led to the semicarbazone as the major product, which is presumably formed via isomerization of an initially generated acyl azo compound.