在这里,我们描述了携带巯基苯酚的核苷碱基类似物C-脱氧核糖核苷3的合成和掺入。1'-β化合物3是通过Friedel-Crafts烷基化反应,然后进行脱保护反应合成的。在SnCl 4的存在下,与3,5-ditoluoyl-1-α/β-甲氧基-2-deoxy-d-核糖和二苯二硫的偶联反应得到α/β混合物2(β/α= 2.8),用硅胶色谱法分离β型。形成亚磷酰胺衍生物后,将C-核苷3掺入DNA中。当将巯基碱基掺入互补的单链(ss)DNA中时,在使用鼓泡O处理后,所得双链体显示出高的热稳定性。2(T m 73℃),但在巯基乙醇存在下(T m 33℃)不稳定。CD谱显示该双链体具有右旋双链结构。氨基质子NMR的温度稳定性研究表明,鼓泡的O 2处理的巯基C-核苷周围的氢键结合强度大于还原剂处理的氢键结合强度。因此,碱对碱二硫键的形成增加了双链体的稳定性。相应地,将二硫键还原为两个硫醇碱基可逆地使DNA
Synthesis and characterization of a DNA analogue stabilized by mercapto C-nucleoside induced disulfide bonding
作者:Akihiko Hatano、Seiji Makita、Masayuki Kirihara
DOI:10.1016/j.bmcl.2004.03.015
日期:2004.5
A redox-active nucleobase analogue of a nucleotide was synthesized and incorporated into DNA using phosphoramidite chemistry. An analogue-containing oligonucleotide in the absence of a reducing reagent formed a stable duplex with a substantially higher melting temperature compared to that of a standard DNA duplex of the same length. (C) 2004 Elsevier Ltd. All rights reserved.
Improved synthesis of mercapto C-nucleoside possessing p-phenyl thiol as base using a lithiated coupling reaction
undesired coupling compound was formed by cleavage of the S-tert-butyl group of S-tert-butyl phenyl sulfide by Lewis acids (BF3 Et2O, SnCl4). The highly stereoselective synthesis of mercapto C-nucleoside was, however, achieved by the addition of p-(tert-butyl)thiophenyllithium to a disiloxane-protected 2-deoxyribonolactone. This route showed moderately good yield at all steps. The tert-butyl moiety coupled
Synthesis and redox-active base-pairing properties of DNA incorporating mercapto C-nucleosides
作者:Akihiko Hatano、Seiji Makita、Masayuki Kirihara
DOI:10.1016/j.tet.2004.12.038
日期:2005.2
73 °C), but was destabilized in the presence of mercaptoethanol (Tm 33 °C). CD spectra showed that the duplex had a right-handed double-stranded structure. Imino proton NMR studies of temperature stability suggested that the strength of hydrogen bonding around the mercapto C-nucleoside was larger when treated with bubbling O2 than when in treated with reducing agent. Thus, formation of the base-to-base
在这里,我们描述了携带巯基苯酚的核苷碱基类似物C-脱氧核糖核苷3的合成和掺入。1'-β化合物3是通过Friedel-Crafts烷基化反应,然后进行脱保护反应合成的。在SnCl 4的存在下,与3,5-ditoluoyl-1-α/β-甲氧基-2-deoxy-d-核糖和二苯二硫的偶联反应得到α/β混合物2(β/α= 2.8),用硅胶色谱法分离β型。形成亚磷酰胺衍生物后,将C-核苷3掺入DNA中。当将巯基碱基掺入互补的单链(ss)DNA中时,在使用鼓泡O处理后,所得双链体显示出高的热稳定性。2(T m 73℃),但在巯基乙醇存在下(T m 33℃)不稳定。CD谱显示该双链体具有右旋双链结构。氨基质子NMR的温度稳定性研究表明,鼓泡的O 2处理的巯基C-核苷周围的氢键结合强度大于还原剂处理的氢键结合强度。因此,碱对碱二硫键的形成增加了双链体的稳定性。相应地,将二硫键还原为两个硫醇碱基可逆地使DNA