Design and synthesis of pyrazolo[3,4-d]pyrimidine and triazolo[4,5-d]pyrimidine based dissymmetrical ‘Leonard linker’ compounds: 1H NMR and crystallographic evidence for folded conformation due to arene interactions
作者:Kamlakar Avasthi、Sheikh M. Farooq、Chandralata Bal、Rishi Kumar、Ashish K. Tewari、Prakas R. Maulik
DOI:10.1016/j.molstruc.2006.12.029
日期:2007.10
4-d]pyrimidin-1-yl)propyl]-5,7-dimethyl/ethyl-sulfanyl-1H/2H/3H-triazolo[4,5-d]pyrimidines (6 and 8) show intramolecularly stacked conformation in solution. X-ray crystallography of one dissymmetrical ‘Leonard/trimethylene’ linker compound (6b) based on two different heterocycles namely pyrazolo[3,4-d]pyrimidine core and triazolo[4,5-d]pyrimidine, for the first time, shows unusual U-motif formed due to intramolecular
Synthesis and biological evaluation of 2-fluoro-8-azaadenosine and related compounds
作者:John A. Montgomery、Anita T. Shortnacy、John A. Secrist
DOI:10.1021/jm00364a023
日期:1983.10
at N-8 of the 8-azapurine ring system. Structure proofs utilized UV and 1H and 13C NMR data. Compounds 6b-e,g and 7b-f were evaluated in the H.Ep.-2 cell culture screen, and compounds 6c-e and 7d were evaluated in the P388 mouse leukemia screen. Adenosine deaminase data are also presented for some compounds.