A Tetramethyl Rhodamine (Tamra) Phosphoramidite Facilitates Solid-Phase-Supported Synthesis of 5‘-Tamra DNA
摘要:
6-Carboxy Tamra 1 was conjugated to:4-hydroxypiperidine with BOP and N-methylmorpholine, and the resulting 5-(N-pipyridyl-4-hydroxy)-Tamra carboxamide 2 was treated with 2-cyanoethyl tetraisopropylphosphorodiamidite to give 5- [N-pipyridyl-4-O-(2-cyanoethyl diisopropylphosphoramidite)]-Tamra carboxamide 3. Solutions of 3 were coupled onto the 5'-hydroxyl of solid-phase-supported DNA fragments with standard amidite coupling techniques. Cleavage and deprotection with aqueous tert-butylamine cocktail gave 5-Tamra-functionalized DNA as well as an additional compound without the Tamra chromophore. A mass spectrum of this product showed the incorporation of tert-butylamine.: The extra product was completely suppressed by including a 5 min acetylation step after coupling. A model study of 3 coupled onto thymidine-functionalized CPG showed similar results. NMR and mass spectra of cleaved products confirmed;the addition of tert-butylamine to the minor product. Coupling a Tamra active ester onto T CPG; which was previously coupled with N-(4-methoxytrityl)piperidyl-4-O-(2-cyanoethyl diisopropylphosphoramidite) A produced. the same major Tamra-bearing product, which coeluted on reverse phase HPLC with the major product generated with 3.
A Tetramethyl Rhodamine (Tamra) Phosphoramidite Facilitates Solid-Phase-Supported Synthesis of 5‘-Tamra DNA
摘要:
6-Carboxy Tamra 1 was conjugated to:4-hydroxypiperidine with BOP and N-methylmorpholine, and the resulting 5-(N-pipyridyl-4-hydroxy)-Tamra carboxamide 2 was treated with 2-cyanoethyl tetraisopropylphosphorodiamidite to give 5- [N-pipyridyl-4-O-(2-cyanoethyl diisopropylphosphoramidite)]-Tamra carboxamide 3. Solutions of 3 were coupled onto the 5'-hydroxyl of solid-phase-supported DNA fragments with standard amidite coupling techniques. Cleavage and deprotection with aqueous tert-butylamine cocktail gave 5-Tamra-functionalized DNA as well as an additional compound without the Tamra chromophore. A mass spectrum of this product showed the incorporation of tert-butylamine.: The extra product was completely suppressed by including a 5 min acetylation step after coupling. A model study of 3 coupled onto thymidine-functionalized CPG showed similar results. NMR and mass spectra of cleaved products confirmed;the addition of tert-butylamine to the minor product. Coupling a Tamra active ester onto T CPG; which was previously coupled with N-(4-methoxytrityl)piperidyl-4-O-(2-cyanoethyl diisopropylphosphoramidite) A produced. the same major Tamra-bearing product, which coeluted on reverse phase HPLC with the major product generated with 3.
A Tetramethyl Rhodamine (Tamra) Phosphoramidite Facilitates Solid-Phase-Supported Synthesis of 5‘-Tamra DNA
作者:Matthew H. Lyttle、Timothy G. Carter、Daren J. Dick、Ronald M. Cook
DOI:10.1021/jo0011134
日期:2000.12.1
6-Carboxy Tamra 1 was conjugated to:4-hydroxypiperidine with BOP and N-methylmorpholine, and the resulting 5-(N-pipyridyl-4-hydroxy)-Tamra carboxamide 2 was treated with 2-cyanoethyl tetraisopropylphosphorodiamidite to give 5- [N-pipyridyl-4-O-(2-cyanoethyl diisopropylphosphoramidite)]-Tamra carboxamide 3. Solutions of 3 were coupled onto the 5'-hydroxyl of solid-phase-supported DNA fragments with standard amidite coupling techniques. Cleavage and deprotection with aqueous tert-butylamine cocktail gave 5-Tamra-functionalized DNA as well as an additional compound without the Tamra chromophore. A mass spectrum of this product showed the incorporation of tert-butylamine.: The extra product was completely suppressed by including a 5 min acetylation step after coupling. A model study of 3 coupled onto thymidine-functionalized CPG showed similar results. NMR and mass spectra of cleaved products confirmed;the addition of tert-butylamine to the minor product. Coupling a Tamra active ester onto T CPG; which was previously coupled with N-(4-methoxytrityl)piperidyl-4-O-(2-cyanoethyl diisopropylphosphoramidite) A produced. the same major Tamra-bearing product, which coeluted on reverse phase HPLC with the major product generated with 3.