5-dihydroimidazoles, whose oxidation gave rise to the corresponding 5-methyl-4H-imidazole 3-oxides. The latter, like 1-hydroxy-4-methyl-2,5-dihydroimidazoles, react with PriONO in the presence of bases to form 4H-imidazole-5-carbaldoxime 3-oxides, which are transformed into 4H-imidazole-5-carbonitrile 3-oxides in the reaction with TsCl in the presence of Et3N. The by-products produced in different steps
3-羟基
氨基-3-甲基丁-2-酮或3-乙基-3-羟基
氨基-戊-2-酮与醛和
氨缩合得到一系列新的1-羟基-4-甲基-2,5-二氢
咪唑,其氧化产生相应的 5-甲基-
4H-咪唑 3-氧化物。后者,如 1-羟基-4-甲基-2,5-二氢
咪唑,在碱存在下与 PriONO 反应生成
4H-咪唑-5-甲酰
肟 3-氧化物,再转化为
4H-咪唑-5-甲腈在 Et3N 存在下与 TsCl 反应中的 3-氧化物。在合成的不同步骤中产生的副产物被分离和表征。