Synthesis of Some New S-Nucleoside Derivatives of 2-Thioxo and (2,4-Dithioxo)-5,6,7,8-Tetrahydrobenzo-Thieno[2,3-d]Pyrimidin-4-(3H)Ones

摘要

Ribosylation of 2-thioxo-5,6,7,8-tetrahydrobenzo thieno[2,3-d]pyrimidin-4(3H)-one 1a and 2,4-dithioxo-5,6,7,8-tetrahydrobenzo thieno[2,3-d]pyrimidine 1b with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofuranose 7 afforded the benzoylated S-nucleoside derivatives 3 and 4, respectively. Debenzoylation of 3 and 4 by using methanolic sodium methoxide yielded the corresponding free S-nucleosides 5 and 6, respectively. Furthermore, the reaction of potassium salt of 2-thioxo-5,6,7,8-tetrahydrobenzo thieno[2,3-d]pyrimidin-4(3H)-one 8 with 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide 9, afforded 10. Deacetylation of the latter by using methanolic sodium methoxide yielded the corresponding S-glycoside, 2-(2′,3′,4′,6′-tetra-hydroxy-β-D-glucopyranosylthio)-5,6,7,8-tetrahydro-benzothieno [2,3-d]pyrimidin-4-one 11. The structural elucidation of the new nucleosides formed was reported.View full textDownload full textKeywords1-O-Acetyl-2,3,5-tri-O-benzoyl-β-D-ribo-furanose, 2,4-dithioxo-benzothieno[2,3-d]pyrimidine, S-glycosides, 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide, 2-thioxo-benzothieno[2,3-d]pyrimidin-4(3H)-oneRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/10426500903147159