Synthesis of N-acetyl-3-fluoro-neuraminic acids.
作者:Tatsuo NAKAJIMA、Hiroshi HORI、Hiroshi OHRUI、Hiroshi MEGURO、Tatsuo IDO
DOI:10.1271/bbb1961.52.1209
日期:——
The addition of F2 to methyl 5-acetamideo-2, 6-anhydro-4, 7, 8, 9-tetra-O-acetyl-2, 3, 5-trideoxy-D-glycero-D-galacto-non-2-enopyranosonate (6) in acetic acid gave a mixture of methyl 5-acetamido-4, 7, 8, 9-tetra-O-acetyl-2, 3, 5-trideoxy-2, 3-difluoro-β-D-erythro-L-gluco-2-nonulopyronosenate (7), methyl 5-acetamido-2, 4, 7, 8, 9-penta-O-acetyl-3, 5-dideoxy-3-fluoro-β-D-erythro-L-gluco-2-nonulosopyranosonate (8) and methyl 5-acetamido-2, 4, 7, 8, 9-penta-O-acetyl-3, 5-dideoxy-3-fluoro-β-D-erythro-L-manno-2-nonulopyranosonate (9). On the other hand, the addition of acetylhypofluorite to 6 in acetic acid gave 8 concomitant with small amounts of 7 and 9. The structural elucidation of 7, 8 and 9 on the basis of their 1H-, 13C- and 19F-NMR spectra are described. Saponification of the ester groups of 7, 8 and 9 gave the corresponding N-acetyl 3-fluoro-neuraminic acids (14, 15 and 16). Compound 14 was a potent inhibitor against neuraminidase.
3-二氟-β-D-赤式-L-葡萄糖-2-壬磺酰胺烯酸酯(7)、5-乙酰氨基-2,4,7,8,9-五-O-乙酰基-3、5-乙酰氨基-2,4,7,8,9-五-O-乙酰基-3,5-二脱氧-3-氟-β-D-赤式-L-葡糖-2-壬磺吡喃糖酸甲酯(8)和 5-乙酰氨基-2,4,7,8,9-五-O-乙酰基-3,5-二脱氧-3-氟-β-D-赤式-L-甘露-2-壬磺吡喃糖酸甲酯(9)。另一方面,将乙酰基次萤石加入乙酸中的 6 中,可得到 8 以及少量 7 和 9。根据 7、8 和 9 的 1H、13C 和 19F-NMR 光谱,对它们的结构进行了阐释。对 7、8 和 9 的酯基进行皂化,可得到相应的 N-乙酰基 3-氟神经氨酸(14、15 和 16)。化合物 14 是一种有效的神经氨酸酶抑制剂。