The Evaluation OF 2′, 3′-Dideoxy-β-D-Erythro-Hex-2′-Enopyranosyl Nucleosides as Potential Antisense Constructs: Synthesis, Biophysical Properties and Enzymatic Stability of 2′-Deoxyadenosine-(3′–6′)-[1-(2′, 3′-Dideoxy-β-D-Erythro-Hex-2′-Enopyranosyl)thymine] Phosphate
摘要:
1-(2',3'-dideoxy-beta-D-erythro-hex-2'-enopryanosyl)thymine was used as a nucleoside substitute in the synthesis of the dimer ApT*. CD studies on the dimer show that it adopts stacked, B-form mini-helices in solution. The title compound, relative to natural ApT, possesses an increased resistance to degradation by nucleases.
Novel guanidinium-based ionic liquids as stationary phases for capillary gas chromatography
作者:Li Zhen Qiao、Kai Lu、Mei Ling Qi、Ruo Nong Fu
DOI:10.1016/j.cclet.2010.04.003
日期:2010.9
present study describes guanidinium-based ionic liquids (GBILs) as stationaryphases for capillarygaschromatography (CGC) and to the best of our knowledge, no related reports are available up to now. In this study, a hexaalkylguanidinium ionic liquid (DOTMG-NTf 2 ) was synthesized and coated statically onto capillary columns. Selectivity of the stationaryphase was evaluated by separating Grob test mixture
Schroeder, Grzegorz; Brzezinski, Bogumil; Leska, Boguslawa, Bulletin of the Polish Academy of Sciences: Chemistry, 1996, vol. 44, # 1, p. 45 - 54
作者:Schroeder, Grzegorz、Brzezinski, Bogumil、Leska, Boguslawa、Gierczyk, Blazej、Jarczewski, Arnold
DOI:——
日期:——
Kinetic study of the reactions of various types of C-acids with amine bases in acetonitrile. An unusual effect of common BH<sup>+</sup> cation on the rate constants
The rates of proton transfer reactions between C-acids of different types such as 1-(4-nitrophenyl)-1-nitroalkanes, 4-nitrophenylcyanomethanes, and 2,4,6-trinitrotoluene, and organic bases such as 1,1,3,3-tetrametylguanidine, 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD), and tri-n-butylamine have been measured in acetonitrile at pseudo-first-order conditions. A general equation for the rates of proton transfer reactions between C-acids and bases with product existing in two forms, ions and ion pairs, has been derived and its applicability tested. The equation works well except for reactions of 1-(4-nitrophenyl)-1-nitroalkanes with guanidines for which the second-order rate constant is diminished with concentration of guanidinium cation, while tetrabutylammonium salts accelerate the reactions. Possible reasons for this are discussed.