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Issue 3, 1989

C-nucleosides. Part 9. Synthesis of carbazole and pyrrole C-nucleosides from 2-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)furan

Abstract

The synthesis of carbazole and pyrrole C-nucleosides from 2-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)furan (1) is described. The key synthetic intermediate γ-keto aldehyde (7) can be obtained from the tetrahydrofuran (5), which was prepared by hydrogenation of the dihydrofuran (3) using 10% palladium–carbon. Treatment of compound (7) with indole in dichloromethane under acidic conditions afforded the protected carbazole (9). Deprotection of compound (9) with methanolic sodium hydroxide afforded compound (11) in 55% yield. Treatment of the furan (5) with ethyl carbamate in the presence of 50% trifluoroacetic acid in acetone afforded, in 26% yield, ethyl-2-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)pyrrole-1-carboxylate (15) and its α isomer (16) in a 7 : 1 ratio. Deprotection of compounds (15) and (16) with methanolic sodium hydroxide afforded compounds (19) and (20).

Article information


J. Chem. Soc., Perkin Trans. 1, 1989, 649-653
Article type
Paper

C-nucleosides. Part 9. Synthesis of carbazole and pyrrole C-nucleosides from 2-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)furan

I. Maeba, T. Takeuchi, T. Iijima, K. Kitaori and H. Muramatsu, J. Chem. Soc., Perkin Trans. 1, 1989, 649 DOI: 10.1039/P19890000649

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