C-Nucleosides. 23. Synthesis of Enaminone Glycoside and 4-(b-D-Ribofuranosyl)quinoline-2-carboxamide from Furanone Glycoside
摘要:
Furanone glycoside (1) was treated with aniline to yield 3-anilino-5-hydroxy-5-(2,3,5-tri-($) under bar O-benzoyl-beta-D-ribofuranosyl)furan-2(5 ($) under bar H)-one (2). Reaction of 2 with trifluoroacetic acid afforded enaminone glycoside (3), whereas treatment of 2 with hydrochloric acid in methanol brought about the ring formation to furnish methyl 4-(2,3,5-tri-($) under bar O-benzoyl-beta-D-ribofuranosyl)quinoline-2-carboxylate (6) together with methyl 2-anilino-4-(3,5-di-($) under bar O-benzoyl-1,4-anhydro-2-deoxy-D-erythropent-1-enofuranosyl)-4-oxobutanoate (4) and methyl 2-anilino-4-(5-benzoyloxymethylfuran-2-yl)-4-oxobutanoate (5) in yields of 12%, 12%, and 7%, respectively. The quinoline ester (6) reacted with aq. ammonia in methanol to produce quinolinecarboxamide ($) under bar C-nucleoside (7).
C-Nucleosides. 23. Synthesis of Enaminone Glycoside and 4-(b-D-Ribofuranosyl)quinoline-2-carboxamide from Furanone Glycoside
摘要:
Furanone glycoside (1) was treated with aniline to yield 3-anilino-5-hydroxy-5-(2,3,5-tri-($) under bar O-benzoyl-beta-D-ribofuranosyl)furan-2(5 ($) under bar H)-one (2). Reaction of 2 with trifluoroacetic acid afforded enaminone glycoside (3), whereas treatment of 2 with hydrochloric acid in methanol brought about the ring formation to furnish methyl 4-(2,3,5-tri-($) under bar O-benzoyl-beta-D-ribofuranosyl)quinoline-2-carboxylate (6) together with methyl 2-anilino-4-(3,5-di-($) under bar O-benzoyl-1,4-anhydro-2-deoxy-D-erythropent-1-enofuranosyl)-4-oxobutanoate (4) and methyl 2-anilino-4-(5-benzoyloxymethylfuran-2-yl)-4-oxobutanoate (5) in yields of 12%, 12%, and 7%, respectively. The quinoline ester (6) reacted with aq. ammonia in methanol to produce quinolinecarboxamide ($) under bar C-nucleoside (7).