Acid-Base Properties of 6-Methyluracil-5-carbonitrile and Its N-Methyl Derivatives
作者:A. A. Akhiyarov、A. N. Lobov、I. B. Chernikova、S. P. Ivanov
DOI:10.1134/s1070363222020037
日期:2022.2
Abstract The constants of acid-base equilibrium of 6-methyluracil-5-carbonitrile in water were determined spectrophotometrically. For the first time, 1,6-dimethyluracil-5-carbonitrile and 3,6-dimethyluracil-5-carbonitrile were obtained, their structures were proved by 1H, 13C, and 15N NMR spectroscopy. Based on the pKa values obtained for all three compounds, the sequence of dissociation in the 6-
摘要 分光光度法测定了6-甲基尿嘧啶-5-甲腈在水中的酸碱平衡常数。首次获得了1,6-二甲基尿嘧啶-5-甲腈和3,6-二甲基尿嘧啶-5-甲腈,并通过1 H、13 C和15 N NMR光谱证明了它们的结构。基于对所有三种化合物获得的 p K a值,确定了 6-甲基尿嘧啶-5-甲腈分子在碱性水溶液中的解离顺序。
HIROTA, KOSAKU;KITADE, YUKIO;SAJIKI, HIRONAO;MAKI, YOSHIFUMI;YOGO, MOTOI, J. CHEM. SOC. PERKIN TRANS. PT 1,(1990) N, C. 367-373
Novel reaction of uracil derivatives possessing electron-withdrawing groups at the 5-position with amines: exchange reaction between the N1-portion of uracils and amines
The reaction of 1,3-disubstituted uracilspossessing an electron-withdrawinggroup such as nitro, carbamoyl, and cyano at the 5-position with primary amines resulted in the exchange of the N1-portion of the uracil ring with the amine moiety. The exchangereactions were influenced by the nature of substituents at the 5- and N1-position. The reaction sequence is explained in terms of addition, ring-opening