Non-nucleoside phosphoramidites of xanthene dyes (FAM, JOE, and TAMRA) for oligonucleotide labeling.

Maksim V Kvach, Dmitry A Tsybulsky, Vadim V Shmanai, Igor A Prokhorenko, Irina A Stepanova, Vladimir A Korshun

Current protocols in nucleic acid chemistry 2013 Mar

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This unit describes the preparation of 5- and 6-carboxy derivatives of the xanthene fluorescent dyes fluorescein (FAM), 4',5'-dichloro-2',7'-dimethoxy-fluorescein (JOE), and tetramethylrhodamine (TAMRA) as individual isomers, and their conversion to non-nucleoside phosphoramidite reagents suitable for oligonucleotide labeling. The use of a cyclohexylcarbonyl (Chc) protecting group for blocking of phenolic hydroxyls facilitates the chromatographic separation of isomers of carboxy-FAM and carboxy-JOE as pentafluorophenyl esters. Acylation of 3-dimethylaminophenol with 1,2,4-benzenetricarboxylic anhydride gave a mixture of 4-dimethylamino-2-hydroxy-2',4'(5')-dicarboxybenzophenones, easily separable into individual compounds upon fractional crystallization. Individual isomeric benzophenones are precursors of 5- or 6-carboxytetramethylrhodamines. The dyes were converted into 6-aminohexanol- (JOE), 4-trans-aminocyclohexanol- (FAM and JOE), and hydroxyprolinol-based (TAMRA) phosphoramidite reagents. © 2013 by John Wiley & Sons, Inc.

Citation

Maksim V Kvach, Dmitry A Tsybulsky, Vadim V Shmanai, Igor A Prokhorenko, Irina A Stepanova, Vladimir A Korshun. Non-nucleoside phosphoramidites of xanthene dyes (FAM, JOE, and TAMRA) for oligonucleotide labeling. Current protocols in nucleic acid chemistry. 2013 Mar;Chapter 4:4.55.1-4.55.33