Solid-Phase Synthesis of Deoxynucleic Guanidine (DNG) Oligomers and Melting Point and Circular Dichroism Analysis of Binding Fidelity of Octameric Thymidyl Oligomers with DNA Oligomers
作者:Barry A. Linkletter、Istvan E. Szabo、Thomas C. Bruice
DOI:10.1021/ja984212w
日期:1999.4.1
A practical solid-phase synthesis of deoxynucleic guanidine (DNG), a positively charged DNA backbone analogue, is reported. The nucleoside coupling step in the solid-phase synthesis of DNG involves the attack of a terminal 3‘-amine upon an electronically activated 5‘-carbodiimide to create a protected guanidinium internucleoside linkage. The activated carbodiimide is synthesized in situ by the mercury(II)
报道了一种实用的固相合成脱氧核胍 (DNG),一种带正电荷的 DNA 骨架类似物。DNG 固相合成中的核苷偶联步骤涉及末端 3'-胺对电子激活的 5'-碳二亚胺的攻击,以产生受保护的胍核苷间键。活性碳二亚胺是通过汞 (II) 从不对称取代的硫脲中提取硫而原位合成的,其中一个取代基是吸电子保护基团,另一个是 5'-核苷单体。除了碳化二亚胺之外,这还会产生硫化汞沉淀物,该沉淀物积聚在固体载体的孔中,限制溶剂和试剂的进入并降低每个连续循环的偶联产率。这一障碍通过一个简单的洗涤步骤来克服,该步骤涉及一种苯硫酚溶液,该溶液很容易去除汞盐。将这一步添加到循环中使 DNG 低聚物能够合成...