The Reaction of 1,2-Diones with Ureas-a Synthesis of 4-(1-Substituted)alkylimidazol-2-ones
作者:Andris J. Liepa、Denis M. J. Wright
DOI:10.1071/ch99130
日期:——
The reaction between glyoxal and ureas or thioureas in formic acid in thepresence of sulfinates gives 4-arylsulfonylimidazol-2-ones such as (3b) and(3e). Labile 4-arylsulfonyl-5-hydroxyimidazolidin-2-ones (2a–c) may beisolated. Acyclic or cyclic 1,2-diketones react with ureas in the presence ofselected nucleophiles to give side-chain substituted imidazol-2-ones(5a–e).
在亚磺酸盐存在下,乙二醛与脲或硫脲在甲酸中的反应得到 4-芳基磺酰基咪唑-2-酮,例如 (3b) 和 (3e)。可以分离不稳定的 4-arylsulfonyl-5-hydroxyimidazolidin-2-ones (2a-c)。无环或环状 1,2-二酮在选定的亲核试剂存在下与脲反应生成侧链取代的咪唑-2-酮 (5a-e)。