The present invention relates to novel unnatural fluorescent nucleic acid bases, that is, a purine base, a 1-deazapurine base, and a 1,7-deazapurine base each having a functional group which consists of two or more heterocyclic moieties linked together, at the 6-position thereof (the 6-position of purine ring). The present invention also relates to a compound containing the unnatural base, a derivative thereof, and a nucleic acid containing a nucleotide having the unnatural base. The present invention also relates to a method of preparing the nucleic acid. The unnatural base of the present invention has excellent fluorescence characteristics and also has excellent properties as a universal base.
本发明涉及新型的非自然荧光核酸碱基,即
嘌呤碱基、1-去氮
嘌呤碱基和1,7-去氮
嘌呤碱基,每个碱基在其6位(
嘌呤环的6位)具有一个由两个或更多杂环基团连接在一起的功能基团。本发明还涉及含有该非自然碱基的化合物、其衍
生物和含有该非自然碱基的核酸中的核苷酸。本发明还涉及制备该核酸的方法。该非自然碱基具有优异的荧光特性,并且具有优异的通用碱基特性。