Synthesis of 4H-imidazole-5-carbaldoxime 3-oxides and 4H-imidazole-5-carbonitrile 3-oxides
作者:I. A. Kirilyuk、D. A. Morozov、Yu. S. Tabatchikova、V. S. Medvedev、A. V. Lebedev、G. V. Romanenko、T. V. Rybalova、I. A. Grigor’ev
DOI:10.1007/s11172-008-0196-3
日期:2008.7
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。