The "abbreviated" model of NAD, 1-[3-(adenin-9-yl)-2-hydroxypropyl]-3-carbamoylpyridinium chloride (VIIIa), and its 2,6-diaminopurine (VIIIb), 3-deazaadenine (VIIIc), guanine (VIIId) and cytosine (VIIIe) analogues were prepared by the Zincke reaction. The (R)-isomer of the adenine model VIIIa (compound IX) was prepared for chiroptical studies. As shown by NMR, UV and CD spectra, neither in dimethyl sulfoxide nor in water any intramolecular π-π interactions exist between the heteroaromatic systems.
NAD的"缩写"模型,1-[3-(腺嘌呤-9-基)-2-羟基丙基]-3-氨基吡啶盐酸盐(VIIIa),以及其2,6-二氨基嘌呤(VIIIb),3-去氧腺嘌呤(VIIIc),鸟嘌呤(VIIId)和胞嘧啶(VIIIe)类似物通过Zincke反应制备。腺嘌呤模型VIIIa的(R)-异构体(化合物IX)已为手性光学研究做好准备。根据NMR、UV和CD光谱显示,无论在二甲基亚砜还是水中,异芳香系统之间不存在任何分子内π-π相互作用。