Preparation of macrocyclic 15N-labelled oligoaminodeoxysaccharides as probes for RNA-binding
作者:Janis Jaunzems、Benjamin Oelze、Andreas Kirschning
DOI:10.1039/b412436g
日期:——
Two macrocyclic aminoglycosides were prepared from a 1,4-butanediol linked 2-deoxy-L-rhamnal which was O-allylated at the 4- and 4′-positions via the precursor allyl 3,4-di-O-acetyl-2,6-dideoxy-α-L-arabino-hexoside employing olefin metathesis and ring closing metathesis in a sequential manner. The macrocycles were 15N-labelled at all four amino groups in order to study interactions with regulatory RNA structures in solution by NMR spectroscopy. A key step for the introduction of the 15N-label was a reductive amination step using commercially available 15NH4OAc. The reductive amination proceeds with excellent stereocontrol. As a by-product the unusual acyclic amino nitrile was isolated which originated from intramolecular imine formation followed by cyanide addition to the intermediate CN double bond.
通过烯烃复分解和环闭合复分解反应,以1,4-丁二醇为前体,在4位和4′位上O-烯丙基化2-脱氧-L-鼠李糖醛,从而制备出两种大环氨基糖苷。为了研究溶液中与调节RNA结构的相互作用,通过核磁共振光谱法对大环的四个氨基进行了15N标记。引入15N标记的关键步骤是使用市售的15NH4OAc进行还原胺化。还原胺化具有出色的立体控制。作为副产品,分离出异常的非环状氨基腈,其来源于分子内亚胺的形成,然后氰化物加成到中间体的CN双键上。