名称:
Stereoselective Reactions OF 1-(4,6-O-Benzylidene-2,3-Didehydro-2,3-dideoxy-3-nitro-β-D-hexopyranosyl)uracil with some Nucleophiles¶
摘要:
Michael addition of benzylamine, piperidine, morpholine, pyrrolidine, cyclohexylamine, allylamine and dimethylmalonate to the nitroolefin (5) generated in situ from 1-(4,6-O-benzylidene-3-deoxy-3-nitro-beta-D-glucopyranosyl)uracil (4b) gave the corresponding 2-(substituted-amino)-3-deoxy-3-nitro-beta-D-glucopyranosides (6a-f and 6h). Reaction of 4b with N,N'-carbonyldiimidazole directly gave 6g. Compound 4b was converted into the 2-deoxy analogue (8), which was reduced to the 3-amino (9) and 3-hydroxylamino analogue (10).