Furanoside–pyranoside isomerization of tubercidin and its 2′-deoxy derivatives: influence of nucleobase and sugar structure on the proton-catalysed reaction
作者:Frank Seela、Sabine Menkhoff、Silvia Behrendt
DOI:10.1039/p29860000525
日期:——
2′-Deoxy-2-methoxytubercidin (6a) which was prepared from the nucleobase (1a) with the halogenose (2)via phase-transfer glycosylation isomerizes rapidly under acidic conditions. Two pyranosides [(7a) and (8a)] and the anomeric furanoside (5a) are formed. The isomerization process was followed kinetically, demonstrating that furanoside formation is kinetically controlled whereas the β-pyranoside (7a)