Homo-N-oligonucleotides (N1/N9−C1‘ Methylene Bridge Oligonucleotides): Nucleic Acids with Left-Handed Helicity
摘要:
Oligonucleotides containing a methylene bridge between N1 or N9 of the heterocyclic base and C1' of the pentofuranosyl ring (homo-N-oligonucleotides) were synthesized. Melting curves revealed that such homo-type oligomers could cross-pair with complementary homo-type or natural oligomers. Circular-dichroic studies provide evidence that the homo-type dinners have a left-handed stacked conformation and further suggest that single-stranded and double-stranded homo-type oligomers adopt a left-handed conformation, while duplexes with natural oligomers or nucleic acids form RNA-like right-handed helices. NMR spectroscopy (NOESY) provides supporting evidence for a left-handed stacked conformation of the homo-type dimer, while atomic force microscopy indicates a left-handed helical conformation of homotype dsDNA. Homo-type dinners and oligomers showed high resistance to digestion by snake-venom and calf-spleen phosphodiesterases and nuclease S1.
本文介绍了一种新的途径,可以通过甲基三氧nucleo(MTO)或负载型MTO催化剂,以H 2 O 2为主要氧化剂,合成1'-homo- N-核苷衍生物。在这些选择条件下,无论所用的底物类型为嘌呤或嘧啶衍生物,杂环的氧官能化和N杂原子氧化都是有效的过程。此外,1'-同型N-硫代核苷的氧化表明杂环发生了位点特异性氧化亲核取代。MTO / H 2 O 2该系统通常显示出在均相和非均相条件下均具有高反应活性,为最终产物提供了高底物转化率和中等至高收率的最终产物。许多新颖的1'-homo- N-核苷类似物对A型流感病毒都具有活性,而没有任何细胞毒性作用,并以受保护和不受保护的形式保留其活性。
Synthesis of homo-N-nucleosides, a series of C1' branched-chain nucleosides
作者:Nafizal Hossain、Norbert Blaton、Oswald Peeters、Jef Rozenski、Piet A. Herdewijn
DOI:10.1016/0040-4020(96)00192-5
日期:1996.4
Homo-N-desoxynucleosides were synthesized starting from 2-deoxy-d-ribose using a one step epoxidation-ring closure appraoch. The configuration of the nucleosides were proven using NMR and X-ray analysis.
The present invention is composed of a nucleoside derivative of the following general formula \x9bI!: ##STR1## (wherein B represents adenin-9-ylmethyl, guanin-9-ylmethyl, hypoxanthin-9-ylmethyl, thymin-1-ylmethyl, uracil-1-ylmethyl, or cytosin-1-ylmethyl; X and Y may be the same or different and each represents hydrogen or hydroxy, exclusive of the case in which X is hydrogen and Y is hydroxy). The compound of the present invention is useful as an antiviral agent or an antimalignant-tumoral agent.
The present invention is composed of a nucleoside derivative of the following general formula [I]:
(wherein B represents adenin-9-ylmethyl, guanin-9-ylmethyl, hypoxanthin-9-ylmethyl, thymin-1-ylmethyl, uracil-1-ylmethyl, or cytosin-1-ylmethyl; X and Y may be the same or different and. each represents hydrogen or hydroxy, exclusive of the case in which X is hydrogen and Y is hydroxy).
The compound of the present invention is useful as an antiviral agent or an antimalignant-tumoral agent.