Utilization of a syn to anti rearrangement for the construction of a centrosymmetric, covalently linked cross section that would direct parallel strandedness in a double-helical polynucleotide
作者:Nelson J. Leonard、Balkrishen Bhat、Scott R. Wilson、Kenneth A. Cruickshank
DOI:10.1021/ja00004a049
日期:1991.2
obtained from the corresponding syn compounds by treatment with ammonia or sodium methoxide in methanol. The anti tetracyclic ring system based on two cytidine units attached to the 1,3,4,6-tetraazapentalene central moiety provides a covalently linked crosssection that is a model for basepairing in a double-helicalpolynucleotidehavingparallel rather than antiparallel strands
已经确定并比较了荧光 1,3,4,6-四氮杂戊烯的 X 射线晶体结构,它们是顺式和反式双取代的嘧啶酮环或嘧啶酮和吡啶环的组合。Syn-二取代的四氮杂戊烯是通过三步序列从 1-乙基胞嘧啶或 O-保护的胞苷(也是 O-保护的腺苷)、氯乙烯二乙缩醛和 2-氨基吡啶或另一个胞嘧啶或胞苷单元合成的。最后一步是借助 I III 化合物进行氧化环化。带有末端嘧啶酮环或嘧啶酮和吡啶环的反二取代四氮杂戊烯通过用氨或甲醇钠在甲醇中处理从相应的顺式化合物中获得。基于连接到 1,3,4 的两个胞苷单元的反四环系统,
Syn to anti rearrangement of dipyrimidinone-substituted 1,3,4,6-tetraazapentalenes. A covalently-linked cross section representative of base pairing in a double-helical polynucleotide having parallel strands