Synthesis of functionalized biphenyl-C-nucleosides and their incorporation into oligodeoxynucleotides
摘要:
We describe the synthesis of eight novel C-nucleosides in which the nucleobases are replaced by biphenyl residues that carry one or two electron donor (-OCH3,-NH2) or acceptor (-NO2) functional groups in the distal ring. These C-nucleosides were synthesized convergently and in high yields from a common bromophenyl-C-nucleoside precursor via Suzuki coupling with the respective boronic acids or esters. These nucleosides were subsequently converted into the corresponding phosphoramidite building blocks and efficiently incorporated into oligodeoxynucleotides by standard phosphoramidite chemistry. (c) 2006 Elsevier Ltd. All rights reserved.
Kuivila于50年前发表的开创性研究表明,硼酸酯的ipso质子化是芳基硼酸的碱催化原脱硼硼烷的机理。但是,该研究仅限于酸性条件下的紫外分光光度法分析,并且估计了水的缔合常数(K a)。借助于NMR,停止流IR和骤冷流技术,现在已经在70°C的二恶烷水溶液中,在pH> 13的条件下,测定了30种不同的芳基硼酸的碱催化原硼酸脱氢反应的动力学。研究中包括C 6 H n F (5- n) B(OH)2的所有20个异构体半衰期跨越9个数量级:<3毫秒至6.5个月。在具有pH率分布,对组合ķ一个和Δ小号⧧值,动力学同位素效应(2 H,10 B,13 C),线性自由能的关系,并密度泛函理论计算,我们已经确定,涉及一种机械制度硼酸酯的单分子杂化与协同的ipso质子化/ C–B裂解竞争。芳基硼酸的相对路易斯酸度与它们的原脱硼氢硼酸速度不相关,特别是当存在邻位取代基时。值得注意的是,3,5-二硝基苯基硼酸
[EN] COMPOSITIONS FOR THE TREATMENT OF HYPERTENSION AND/OR FIBROSIS<br/>[FR] COMPOSITIONS POUR LE TRAITEMENT DE L'HYPERTENSION ET/OU DE LA FIBROSE
申请人:VECTUS BIOSYSTEMS PTY LTD
公开号:WO2015039172A1
公开(公告)日:2015-03-26
The present invention relates to novel compounds and their use in the prophylactic and/or therapeutic treatment of hypertension and/or fibrosis.
本发明涉及新化合物及其在预防性和/或治疗高血压和/或纤维化的用途。
NOVEL INHIBITORS OF HEPATITIS C VIRUS REPLICATION
申请人:Beigelman Leonid
公开号:US20090047246A1
公开(公告)日:2009-02-19
The embodiments provide compounds of the general Formula I, as well as compositions, including pharmaceutical compositions, comprising a subject compound. The embodiments further provide treatment methods, including methods of treating a hepatitis C virus infection, the methods generally involving administering to an individual in need thereof an effective amount of a subject compound or composition.
Design of rotational potential in a phenyltriptycene molecular rotor by exploiting CH/π-interaction between tripticil hydrogen and phenyl
作者:Hazuki Inami、Yusuke Inagaki、Wataru Setaka
DOI:10.1039/d2ob01179d
日期:——
The chemistry of artificial molecularrotors has recently attracted considerable attention in the field of molecular machines. Phenyltriptycene could be used as a stepwise molecularrotor because it is composed of a phenyl rotor and a triptycene stator, in which the rotational potential can be designed by introducing substituents. In this study, a novel design of the relative energies among three rotamers
and extensively tested for their ability to accelerate the Michael reaction between acetylacetone and trans-β-nitrostyrene. There is a strong correlation between the Hammett parameter of the modulating groups and catalytic activity following UV irradiation. Electron-withdrawing groups afford the largest reactivity difference between the catalysts in their ring-open form and their ring-closed isomer
Amino-λ3-iodanes enable the electrophilicamination of arylboronic acids and boronates. Iodine(III) reagents with transferable amino groups, including one with an NH2 group, were synthesized and used in the amination, allowing the synthesis of a wide range of primary and secondary (hetero)arylamines.