作者:Rong J. Lu、Roger W. Giese
DOI:10.1021/ac990384f
日期:2000.4.1
Acetamide, 2-amino-N-[[3,5-bis(trifluoromethyl)phenyl]methyl]-N-methyl-, monohydrochloride, which we have named AMACE1, was synthesized in three steps starting from N-tritylglycine. AMACE1 was coupled via its primary amine group (pKa 8.2) under aqueous conditions to four model analytes for oxidative sugar damage to DNA: glycolate, 3-hydroxy-2-butanone, 3-phenylbutyraldehyde, and α-hydroxy-γ-butyrolactone, relying on cyanoborohydride for coupling to a keto function and a water-soluble carbodiimide for coupling to a carboxyl function. Further reaction with butyric anhydride led to products that could be detected by gas chromatography/electron capture mass spectrometry when 1 μL of ethyl acetate containing essentially 20 amol of each product was injected, on the basis of selected ion monitoring of the analyte characteristic anion fragment from dissociative loss of the 3,5-bis(trifluoromethyl)phenylmethyl moiety: m/z 215, 289, 299, and 329, respectively. Since many small, organic analytes contain a keto or carboxylic acid group, AMACE1 should be useful in general in the area of trace organic analysis.
我们合成了名为AMACE1的化合物,即单盐酸形式的2-氨基-N-[[3,5-双(三氟甲基)苯基]甲基]-N-甲基乙酰胺。合成过程从N-苄基甘氨酸开始,分三步完成。AMACE1通过其一级氨基(pKa 8.2)在水环境下与四种代表性分析物——因氧化糖损害DNA而生成的甘醇酸、3-羟基-2-丁酮、3-苯基丁醛和α-羟基-γ-丁内酯发生偶联反应。其中利用氰基硼氢化物与酮功能团偶联,使用水溶性碳二亚胺与羧酸功能团偶联。进一步与丁酸酐反应得到产物,当向其中注入主要含有20阿摩尔每种产物的1微升乙酸乙酯时,可以通过气相色谱/电子捕获质谱进行检测,基于特定阴离子片段的选择离子监测(该片段在失去3,5-双(三氟甲基)苯基甲基部分后发生裂解):分别为m/z 215、289、299和329。由于许多小分子有机分析物包含酮或羧酸基团,AMACE1在痕量有机分析领域应有广泛的应用潜力。