Synthesis of Willardiine and 6-Azawillardiine Analogs: Pharmacological Characterization on Cloned Homomeric Human AMPA and Kainate Receptor Subtypes
作者:David E. Jane、Ken Hoo、Raj Kamboj、Michele Deverill、David Bleakman、Allan Mandelzys
DOI:10.1021/jm9702387
日期:1997.10.1
have also been identified. It would appear that quite large lipophilic substituents at the 5-position of the uracil ring not only are accommodated by hGluR5 receptors but also lead to enhanced affinity for these receptors. In contrast to this, for optimal binding affinity to hGluR1, -2, or -4, smaller, electron-withdrawingsubstituents are required. For optimal activity at hGluR4 receptors a 6-aza-substituted
1-[(2-Acetoxyethoxy)methyl]-5-chloro-6-azauracil has been prepared and its unambiguous assignment of H-1 and C-13 peaks through the H-1-C-13 heteronuclear correlation (HETCOR) NMR experiments is described. The isosteric 1-[(2- acetoxyethoxy)methyl]-5-bromo-6-azaisocytosine has also been synthesized. The X-Ray crystallographic analysis reveals unambiguously the site of glycosylation at N-1 Deacetylation of both acyclonucleosides provided 5-chloro-1-[(2-hydroxyethoxy)methyl]6-azauracil and 5-bromo-1-[(2-hydroxyethoxy)methyl]-6-azaisocytosine respectively. Their structures have been well established by the NMR spectra and the elemental analyses.