Structural characterization of products arising from methylsulfanyl group oxidation in pyrimidine derivatives using 13C NMR spectroscopy
作者:Alexander V. Komkov、Mikhail A. Kozlov、Darina I. Nasyrova、Andrey S. Dmitrenok、Eugene I. Bozhenko、Igor V. Zavarzin
DOI:10.1007/s10593-023-03163-5
日期:——
carbon atom in the spectra of fused heterocycles or C-5 carbon atom in the spectra of pyrimidines. At the same time, the chemical shift values of C-4a (or C-5) atoms practically did not depend on the particular sulfur-containing functionality: sulfanyl or sulfonyl group. A significant upfield shift was observed for the C-4 atom in 13C NMR spectra of sulfones compared to the spectra of compounds containing
对先前合成的吡啶并[2,3-d]-嘧啶-5-酮、吡啶并[2,3- d ]pyrimidin-7-ones, pyrimido[4,5- d]嘧啶和 5-乙酰基嘧啶,在第 4 位含有甲基硫基、甲基磺酰基、丁氧基和氨基。可以根据以下条件确定与 C-4 碳原子键合的杂原子(硫、氧或氮)的类型在稠合杂环光谱中观察到 C-4a 碳原子或在嘧啶光谱中观察到 C-5 碳原子的化学位移。同时,C-4a(或 C-5)原子的化学位移值实际上并不取决于特定的含硫官能团:硫烷基或磺酰基。与含有甲硫基部分的化合物的光谱相比,在砜的13 C NMR 光谱中观察到 C-4 原子的显着上场偏移。