Stereoselectivity in the Preparation of 5,6-Dideoxy-5-dimethoxyphosphinyl-D- and -L-hexofuranoses, and an Efficient Synthesis of 5,6-Dideoxy-5-hydroxyphosphinyl-L-galactopyranose (a P-in-the-Ring L-Fucose Analogue)
作者:Tadashi Hanaya、Kiyomi Yasuda、Hiroshi Yamamoto、Hiroshi Yamamoto
DOI:10.1246/bcsj.66.2315
日期:1993.8
depending upon the kinds of substituents on the β-side of the furanose ring of the intermediate 5,6-dideoxy-hex-5-enofuranoses. A P-in-the-ring sugar analogue of L-fucose type, 5,6-dideoxy-5-hydroxyphosphinyl-L-galactopyranoses, was efficiently prepared from 3-O-benzyl-5,6-dideoxy-1,2-O-isopropylidene-5-dimethoxyphosphinyl-α-L-galactofuranose readily obtained by the selective preparation mentioned above
将膦酸二甲酯添加到 5 种 6-O-tosyl-hexofuranos-5-uloses 3a-e(α-D-xylo、α-D-ribo、β-D-arabino、α-D-lyxo 和 β -D-ribo) 在 DBU 存在下,然后在 Raney-Ni (W-4) 存在下催化氢解,得到 (5S)- 和 (5R)-5,6- 二脱氧-己呋喃糖衍生物1:0-2:1,取决于中间体5,6-二脱氧-己-5-烯呋喃糖的呋喃糖环的β-侧上的取代基种类。由 3-O-benzyl-5,6-dideoxy-1,2- 有效地制备了 L-岩藻糖类型的 P-in-the-ring 糖类似物 5,6-dideoxy-5-hydroxyphosphinyl-L-galactopyranoses O-异亚丙基-5-二甲氧基膦基-α-L-呋喃半乳糖很容易通过上述选择性制备得到。