Reaction of 2-Alkoxypropenals with α-Hydroxyamino Oximes and 1,2-Bis(hydroxyamino)cyclohexane
作者:N. A. Keiko、E. A. Funtikova、L. I. Larina、G. I. Sarapulova、D. G. Mazhukin、T. V. Rybalova、A. Ya. Tikhonov
DOI:10.1007/s11178-005-0361-1
日期:2005.10
Reactions of 2-alkoxypropenals with α-hydroxyamino oximes in neutral medium involve the aldehyde group of the former to afford both acyclic and cyclic azomethine oxides: N-(2-hydroxyiminoalkyl)-N-(2-alkoxy-2-propenylidene)amine oxides and 1-hydroxy-2,5-dihydroimidazole 3-oxides. The state of tautomeric equilibrium between the cyclic and acyclic products depends on the solvent nature and temperature. The reaction in acidic aqueous medium is accompanied by hydrolysis of the vinyl ether moiety in 2-alkoxy-propenals with formation of 2-oxopropionaldehyde which reacts with α-hydroxyamino oxime at the hydroxy-amino group to give substituted pyrazine 1,4-dioxides. The reaction of 2-alkoxypropenals with 1,2-bis-(hydroxyamino)cyclohexane leads to formation of 2-(1-alkoxyvinyl)-1,3-dihydroxyperhydrobenzimidazoles. The structure of the products was proved by IR, UV, and 1H and 13C NMR spectroscopy and X-ray analysis.
2-烷氧丙烯醛与α-羟基氨基肟在中性介质中的反应涉及前者的醛基,生成无环和环状的亚胺氧化物:N-(2-羟基亚胺烷基)-N-(2-烷氧基-2-丙烯基)胺氧化物和1-羟基-2,5-二氢咪唑-3-氧化物。环状和无环产物之间的并置平衡状态取决于溶剂的性质和温度。在酸性水相中反应伴随着2-烷氧基丙烯醛中乙烯醚部分的水解,形成2-氧丙醛,该醛与α-羟基氨基肟在羟基氨基组上反应,生成取代的吡嗪1,4-二氧化物。2-烷氧丙烯醛与1,2-双(羟基氨基)环己烷的反应生成2-(1-烷氧基乙烯基)-1,3-二羟基全氟苯并咪唑。产品的结构通过红外光谱、紫外光谱、1H和13C核磁共振光谱以及X射线分析得到了验证。