Effect of the Structure of 1- and 3-Methylpyrimidin-4-ones on the Rate of Nucleophilic Substitution of the 2-Methylsylfanyl Group
作者:G. M. Kheifets、V. A. Gindin、T. A. Nikolova
DOI:10.1023/b:rujo.0000034918.26019.44
日期:2004.1
Rate constants for substitution of the 2-methylsulfanyl group in 1- and 3-methyl-2-methylsulfanylpyrimidin-4-ones and their 5-fluoro analogs were measured in the reaction with butylamine, alkaline hydrolysis, and methanolysis. The rate of substitution in 1-methyl isomers having a zwitterionic structure is greater by a factor of similar to2 than the rate of substitution in 3-methyl isomers with conjugated double bonds in the ring. The presence of a fluorine atom in position 5 accelerates nucleophilic substitution in 1-methyl isomers, while 5-fluoro-3-methyl-2-methylsulfanylpyrimidin-4-ones react at a lower rate than their 5-unsubstituted analogs. According to the NMR data, the reactions involve formation of a tetrahedral intermediate. Anchimeric effect of the methyl group on N-1 hampers attack by basic reagent on the C-6 atom.
Relative enthalpies of 1,3-dimethyl-2,4-pyrimidinedione, 2,4-dimethoxypyrimidine, and 4-methoxy-1-methyl-1-2-pyrimidinone: estimation of the relative stabilities of two protomers of uracil
作者:Peter Beak、J. Matthew White
DOI:10.1021/ja00389a032
日期:1982.12
HSAB Driven chemoselectivity in alkylation of uracil derivatives. A high yielding preparation of 3-alkylated and unsymmetrically 1,3-dialkylated uracils
作者:Augusto Gambacorta、Mohamed Elmi Farah、Daniela Tofani