A number of new pyrazolo[3,4-c] and [4,3-b]pyridine C-nucleosides, which can be viewed as 4- or 6-deazaformycin analogues were synthesized and examined as potential adenosine deaminase (ADA) inhibitors. The compounds were prepared through the condensation of a suitably substituted, lithiated 2- or 4-methylpyridine with tri-O-benzyl-d-ribonolactone, followed by borohydride reduction of the resulting
合成了许多新的吡唑并[3,4- c ]和[4,3- b ]吡啶C-核苷,可以将其视为4-或6-脱氮福星霉素类似物,并作为潜在的腺苷脱氨酶(ADA)抑制剂进行了研究。通过将适当取代的,锂化的2-或4-甲基吡啶与三-O-苄基-d缩合来制备化合物-核糖内酯,然后将所得的半缩醛进行硼氢化还原,将衍生的二醇进行分子内的Mitsunobu环化,形成吡唑并吡啶环系统,然后除去保护基。这些衍生物是根据酶催化位点内对接模拟提供的结构基础设计的,但是它们显示出弱的ADA抑制活性。理论计算有助于解释获得的生物学数据,从而为该分子支架内的合理结构修饰提供指导。
Synthesis and Antiviral Activity Evaluation of some Novel Acyclic C-Nucleosides
The preparation of novel 5-amino or 7-hydroxy substituted pyrazolo[4,3-b]pyridine and pyrazolo[3,4-c]pyridine acyclic C-nucleosides is described. Their synthesis was carried out by condensation of suitably substituted lithiated picolines with 2-benzyloxyethoxymethylchloride followed by pyrazole ring annulation. The compounds were evaluated for their antiviral activity against a wide panel of viruses
NMR study of 5-substituted pyrazolo[3,4-c]pyridine derivatives
作者:Orestis Tsikouris、Tomáš Bartl、Jaromír Toušek、Nikolaos Lougiakis、Tony Tite、Panagiotis Marakos、Nicole Pouli、Emmanuel Mikros、Radek Marek
DOI:10.1002/mrc.2226
日期:2008.7
4‐c]pyridine derivatives. Six compounds were fully characterized by using 1H, 13C, and 15N chemical shifts and indirect 1H13C and 1H15N couplingconstants. The 1H NMR spectra were measured over a broad range of temperatures. All of the compounds were shown to exist predominantly in the N1‐H tautomeric form. Complementary quantum‐chemical calculations of the chemical shieldings and indirect spin‐spin couplings