作者:Mrinal K. Kundu、Andras Földesi、Jyoti Chattopadhyaya
DOI:10.1002/hlca.200390062
日期:2003.3
as the key reaction. For C(5), two different routes were envisaged: on the one hand, deuterated achiral reagent was treated with a conformationally locked sugar moiety 15, while, on the other, chiral protonated sources were used to transfer the H-atom to a C(5)-deuterated aldehyde 18. In all cases, enantiomeric and isotopic purities were found to be as high as >97% as determined by NMR spectroscopy.
鉴于H原子在戊糖残基上以立体选择性/立体特异性方式通过其稳定同位素2 H进行位点特异性取代的重要性,从而减少了1D和2D同核和异核相关区域中的光谱过度拥挤寡核苷酸DNA和-RNA的光谱,总是需要开发在核糖的不同位点掺入2 H的新方法。C(2)-和(5 R)-和(5 S)-3,5-氘代核糖衍生物已被设想用于将多标记核苷位点特异性掺入寡聚体中,以利于通过NMR光谱阐明其结构。适当的衍生化后,所有合成均从D-葡萄糖开始。在C(2)的情况下,掺入> 97原子%的同位素,采用C(2)处的构型反转作为关键反应。对于C(5),设想了两种不同的途径:一方面,使用构象锁定的糖部分15处理氘代非手性试剂,另一方面,使用手性质子化来源将H原子转移至C (5)氘化的醛18。在所有情况下,通过NMR光谱测定,发现对映体和同位素纯度高达> 97%。