作为扩大遗传字母表努力的一部分,我们评估了大量主要为疏水性的非天然碱基对。我们现在报告在不同位置用甲基修饰的简单苯环之间形成的非天然碱基对的合成和稳定性。令人惊讶的是,在同一序列环境中,一些非天然碱基对实际上与天然碱基对一样稳定。结果表明,双链 DNA 内的碱基对稳定性既不需要氢键键合,也不需要大的芳香族表面积,并且可以优化小芳香环之间的链间相互作用以提高稳定性和选择性。这些较小的核碱基预计不会引起双链 DNA 或引物末端的扭曲,这些扭曲似乎限制了较大的非天然碱基对的复制,
A Mild and Convenient Procedure for Conversion of Aromatic Compounds into Their Iodides Using Ammonium Hexanitratocerate(IV)
作者:Takashi Sugiyama
DOI:10.1246/bcsj.54.2847
日期:1981.9
Polymethylbenzenes, polymethoxybenzenes, and naphthalene are iodinated with tetrabutylammonium iodide, alkalimetal iodides, or molecular iodine in the presence of ammonium hexanitratocerate(IV). Ammonium hexanitratocerate(IV) behaves as a catalyst in the latter system, whereas it is a reagent in the fomer two.
Halogenation Using Quaternary Ammonium Polyhalides. XIV. Aromatic Bromination and Iodination of Arenes by Use of Benzyltrimethylammonium Polyhalides–Zinc Chloride System
The reaction of arenes with benzyltrimethylammonium tribromide or benzyltrimethylammonium dichloroiodate in acetic acid in the presence of ZnCl2 at room temperature or at 70 °C gave bromo- or iodo-substituted arenes in good yield, respectively.
different aromatic compounds 1a–1t with iodine and a mercury(II)-salt 2 [mercury(II) chloride, nitrate or triflate] (1:1:1 molar ratio) in dichloromethane at room temperature leads to the corresponding iodoarene 3, the obtained regiochemistry being the expected. Concerning the mercury(II) salt, the observed reactivity decreased in the series triflate&>nitrate&>chloride according to their ionic character.
Syntheses of Diiodo and Triiodo Derivatives of 1,2,3-Trimethylbenzene (<i>Hemimellitene</i>) and 1,2,4-Trimethylbenzene (<i>Pseudocumene</i>). A Convenient Use of Polyiodo Derivatives for the Characterization of Polyalkylbenzenes and Their Derivatives
作者:Hitomi Suzuki、Yasuhiro Haruta
DOI:10.1246/bcsj.46.589
日期:1973.2
A complete set of diiodo and triiodo derivatives of 1,2,3-trimethylbenzene and 1,2,4-trimethylbenzene has been prepared and their physicalproperties are recorded. Use of polyiodo derivatives as a means for characterizing polyalkylbenzenes and their derivatives has been proposed.
2-Arylpyridines from 2-pyridylcopper/triphenylphosphine and iodoarenes
作者:Hans Malmberg、Martin Nilsson
DOI:10.1016/s0040-4020(01)87553-0
日期:1986.1
2-Arylpyridines are formed rather selectively in 50 to 80 % yields from 2-pyridylcopper and unactivated iodoarenes in the presence of one to two mol triphenylphosphine in toluene around 100 °C. The selectivity may be due to the ability of the copper(I) iodide-triphenylphosphine complex as a leaving group or may be discussed in terms of oxidative addition/reductive elimination. The unsymmetric coupling