摘要:
Three isomers of 9-(4,6-O-benzylidene-3-deoxy-beta-D-hexopyranosyl) adenines (2-4) were isolated. The manno isomer 2 could be isomerized to the gluco isomer 3. The manno (2) and galacto isomer (4) were deprotected to 5 and 7, respectively. Michael addition of some organic amines and thiolates to the nitroolefin intermediate (8) gave the corresponding 2-(substituted)-3-nitro-glucopyranosides (9a-h). Compounds 9a,c,h were deprotected to l0a,c,h. Sodium azide with 8 gave the triazolo nucleoside 11, which was deprotected to 12. 2-Deoxy-3-nitro analogue 14 was also obtained.