prebiotic routes towards RNA. Contemporary RNA, however, is not only constructed from the four canonical nucleobases (A, C, G, and U), it also contains many chemically modified (noncanonical) bases. A still open question is whether these noncanonicalbases were formed in parallel to the canonical bases (chemical origin) or later, when life demanded higher functional diversity (biological origin). Here
Efficient access to 3′-<i>O</i>-phosphoramidite derivatives of tRNA related <i>N</i><sup>6</sup>-threonylcarbamoyladenosine (t6A) and 2-methylthio-<i>N</i><sup>6</sup>-threonylcarbamoyladenosine (ms2t6A)
作者:Katarzyna Debiec、Elzbieta Sochacka
DOI:10.1039/d0ra09803e
日期:——
5′-tri-O-acetyl protected adenosine or 2-methylthioadenosine, the corresponding 3′-O-phosphoramidite monomers were obtained in 48% and 42% overall yield (5 step synthesis). In an analogous synthesis, using the 2′-O-(tert-butyldimethylsilyl)-3′,5′-O-(di-tert-butylsilylene) protection system at the adenosine ribose moiety, the t6A-phosphoramidite monomer was obtained in a less laborious manner and in a remarkably
开发了一种在受保护的超修饰N 6 -苏氨酰氨基甲酰基腺苷 ( t 6 A ) 及其 2-SMe 类似物 ( ms 2 t 6 A ) 的无差向异构化一锅法合成过程中形成脲基键的有效方法。该方法基于 Tf 2 O 介导的N -Boc-苏氨酸的N -Boc 保护基团直接转化为异氰酸酯衍生物,然后与糖保护核苷的N 6外氨基官能团反应(产率86–94%)。从2',3',5'-三-O-乙酰基保护的腺苷或2-甲硫腺苷开始,得到相应的3'- O-亚磷酰胺单体,总产率为48%和42%(5步合成)。在类似的合成中,使用腺苷核糖部分的2'- O- (叔丁基二甲基甲硅烷基)-3',5'- O- (二叔丁基亚甲硅基)保护系统,获得了t 6 A-亚磷酰胺单体以更省力的方式实现 74% 的显着更高产率。
DMAP and TBPP-mediated synthesis of urea-substituted nucleobases and nucleosides
作者:Chaebin Han、Sun Choi、Jinha Yu
DOI:10.1016/j.tet.2023.133472
日期:2023.6
Urea-functionalized nucleobases and nucleosides have emerged as versatile compounds with potential applications in a wide range of fields. Conventionally, the synthesis of urea involves the reaction of isocyanates with nucleobases and nucleosides. In contrast, this study presents a novel and efficient one-pot method for the synthesis of urea-substituted nucleobases and nucleosides without the use of isocyanates
Loading of Amino Acids onto RNA in a Putative RNA‐Peptide World
作者:Johannes N. Singer、Felix M. Müller、Ewa Węgrzyn、Christina Hölzl、Hans Hurmiz、Chuyi Liu、Luis Escobar、Thomas Carell
DOI:10.1002/anie.202302360
日期:——
The loading of RNAs with aminoacids constitutes the first step toward RNA-based peptide synthesis in a putative prebiotic RNA-peptide world. The efficient loading of RNA strands incorporating N-methylcarbamoyl nucleotides with a series of aminoacids is reported. The loaded RNA strands also underwent RNA-based aminoacid transfer reactions.
This invention provides novel benzene derivatives which are leukotriene antagonists, certain novel intermediates to the compounds, formulations of the compounds, and a method of using the compounds for the treatment of conditions characterized by an excessive release of leukotrienes.