An N-monomethoxytrityloxyethyl or-hexyl group was introduced onto the 5'-phosphoryl group of N-protected-3'-benzoyldeoxynucleosides. After 3'-O-debenzoylation and phosphitylation, they were converted 3'-phosphoramidite derivatives. These were used at the last coupling reaction in the synthesis of octadecadeoxynucleotides with an aminoethyl or aminohexyl group at the 5' end by the phosphite-triester method on long-chain alkylamine controlled pore glass beads. Partially deblocked oligomers, after thiophenol and ammonia treatment, were separated rapidly on a reversed-phase C-18 silica gel column by utilizing the hydrophobic nature of the monomethoxy-trityl group. After AcOH treatment, the octadecamers with an aminoethyl or aminohyxyl group at the 5' end were obtained and then coupled with a fluorescent compound. The ultraviolet-temperature profiles were measured after hybridization with a complementary oligonucleotide.
在N-保护的3'-苯甲氧基脱氧
核糖核苷的5'-
磷酸基团上引入了N-单甲氧基三苯基氧乙基或六基团。经过3'-O-去苯甲酰化和
磷酰化后,它们被转化为3'-
磷酰胺衍
生物。这些衍
生物在合成具有
氨基乙基或
氨基己基的18个脱氧核苷酸的最后偶联反应中使用,采用
磷酸三酯法在长链烷基胺控制的孔
玻璃珠上进行。经过
硫酚和
氨处理的部分去保护寡聚物,通过利用单甲氧基三苯基基团的疏
水性,迅速在反相C-18
硅胶柱上分离。经
过醋酸处理,获得了5'端带有
氨基乙基或
氨基己基的18聚体,随后与荧光化合物进行偶联。与互补寡核苷酸杂交后,测量了紫外-温度特征。