Synthesis of methyl 3-deoxy-3-nitroheptoseptanosides
摘要:
The reaction of the dioxepane 2, obtained by periodate oxidation of methyl 4,6-O-benzylidene-alpha-D-glucopyranoside, with nitromethane, using potassium fluoride as catalyst, gave methyl 5,7-O-benzylidene-3-deoxy-3-nitro-D-glycero-alpha-D-ido-heptoseptanoside (2) as the major product. The reaction of 4 with methyl nitroacetate followed by acetylation gave methyl 2,4-di-O-acetyl-5,7-O-benzylidene-3-deoxy-3-C-methoxycarbonyl-3-nitro-D-glycero-alpha-D-talo-(6) and -D-glycero-alpha-D-ido-heptoseptanoside (7).