Synthesis, NMR characterization and<i>ab initio</i>6-31G* study of 1-aryl-2,3-dialkyl-1,4,5,6-tetrahydropyrimidinium salts
作者:Fernando Niemevz、Natalia P. Link、Isabel A. Perillo、Liliana R. Orelli
DOI:10.1002/jhet.5570420410
日期:2005.5
We describe the synthesis of a series of 1-aryl-2,3-dialkyl-1,4,5,6-tetrahydropyrimidinium salts 1, by alkylation of the corresponding 1,4,5,6-tetrahydropyrimidines 2. We analyze the changes in the 1H and 13C NMR spectra of compounds 2 induced by protonation and quaternization. The results of an ab initio theoretical study on amidine 2a, and the cations resulting from its protonation (2aH+) and quaternization
我们描述了一系列的1-芳基-2,3-二烷基-1,4,5,6-四氢嘧啶盐1的合成,通过烷基化相应的1,4,5,6-四氢嘧啶2。我们分析了质子化和季铵化诱导的化合物2在1 H和13 C NMR光谱中的变化。提出了对am 2a进行从头算理论研究的结果,以及由其质子化(2aH +)和季铵化(la +)产生的阳离子。发现13之间有定性相关质子化情况下的13 C NMR和理论数据。还讨论了取代图形在化合物1的1 H和13 C NMR光谱中的影响。