Commercially available 4-nitroimidazole can be transformed in a few simple steps into 4-aminoimidazoyl-5-carboximes, from which the respective purine mono-1-oxides may be synthesized. The N→O functionality in these products significantly changes the electron density in the purine skeleton and consequently, the determination of the 1H- and 13C-NMR spectra of these simple compounds is somewhat troublesome. The use of the ACD/Labs software package for this purpose is discussed.
市售的4-硝基
咪唑可以通过几个简单的步骤转化为
4-氨基咪唑-5-
羧酸甲酯,从而合成相应的
嘌呤单-1-氧化物。这些产品中的N→O官能团显著改变了
嘌呤骨架中的电子密度,因此,确定这些简单化合物的1H-和13C-NMR光谱有些麻烦。本文讨论了为此使用ACD/Labs软件包的情况。