4′,5′-Dichloro-2′,7′-dimethoxy-5(6)-carboxyfluorescein (JOE): Synthesis and Spectral Properties of Oligonucleotide Conjugates
作者:Dmitry A. Tsybulsky、Maksim V. Kvach、Irina A. Stepanova、Vladimir A. Korshun、Vadim V. Shmanai
DOI:10.1021/jo202229t
日期:2012.1.20
convenient procedure for the preparation of the fluorescent dye 4′,5′-dichloro-2′,7′-dimethoxy-5(6)-carboxyfluorescein (JOE) is reported; the overall yield achieved starting from isovanillin is 10 times higher (40% vs 4%) compared to the known procedure. Isomers (5- and 6-) are easily chromatographically separable as pentafluorophenyl esters of 3′,6′-O-bis(cyclohexylcarbonyl) derivatives. Four non-nucleoside
报道了一种方便的制备荧光染料4',5'-dichloro-2',7'-dimethoxy-5(6)-羧基荧光素(JOE)的方法。与已知方法相比,从异香草醛开始获得的总收率要高10倍(40%比4%)。异构体(5-和6--)易于色谱分离为3',6'- O-双(环己基羰基)衍生物的五氟苯基酯。四种基于5和6异构体以及柔性6-氨基己醇(AH)或刚性4- trans的非核苷JOE亚磷酰胺已经制备了-氨基环己醇(ACH)接头,并将其用于寡核苷酸标记。已经研究了5'-JOE修饰的寡核苷酸的光谱和光物理性质。染料的荧光量子产率与接头的性质(刚性或柔性)以及与JOE残基非常接近的dG核苷的存在有关。