Bussolari JC, Stoeckler JD, Panzica RP. The synthesis and biological evaluation of 4-p-nitrobenzylthio-v-triazolo[4,5-d]pyridazine and imidazo[4,5-d]pyridazine ribosides as potential nucleoside transport inhibitors.
Bioorg Med Chem 1996;
4:1725-31. [PMID:
8931943 DOI:
10.1016/0968-0896(96)00188-5]
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Abstract
The synthesis of S4-substituted nucleosides possessing the imidazo- and v-triazolo[4,5-d]pyridazine ring systems was undertaken and the compounds prepared were evaluated as inhibitors of nucleoside transport into human erythrocytes. 1-(2,3,5-Tri-O-acetyl-beta-D-ribofuranosyl)-v-triazolo[4,5-d]pyridazine- 4 (5H)-thione and 1-(2,3,5-tri-O-acetyl-beta-D-ribofuranosyl)imidazo[4,5-d]pyridazine-4 (5H)-thione were each synthesized by two different routes and served as precursors for the title analogues. The nitrobenzylmercaptopurine riboside (NBMPR) analogues, 4-(p-nitrobenzylthio)-1-(beta-D-ribofuranosyl)imidazo[4,5-d]pyrida zine and 4-(p-nitrobenzylthio)-1-(beta-D-ribofuranosyl)-v-triazolo[4,5-d]py ridazine, inhibited the transport of adenosine, but were approximately 4- and 28-fold less active, respectively, than NBMPR and nitrobenzylthioformycin, known potent and specific inhibitors of carrier-mediated transport.
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