-α-L-glucopyranoside (1, 12% and 2, 8.8%). In the case of methyl α-D-glucopyranoside, products 3 (8.6%) and 4 (8.0%) were antipodes of 1 and 2, respectively. Denitrohydrogenation of 1 or 3 with tributyltin hydride in toluene led to 3-deoxy-3-C-methyl-β-D-pyranosides (gluco, 5, 61% and allo, 6, 22%) or L-pyranosides (gluco, 9, 65% and allo, 10, 19%), respectively. This sequence of the reaction was a novel
在
甲醇钠存在下用
硝基乙烷环化由甲基 β-
D-吡喃葡萄糖苷和乙酰化产生的二醛产生的二醛生成甲基 2,4,6-tri-O-acetyl-3-C-methyl-
3-硝基-β-D- 和 -α-L-
吡喃
葡萄糖苷(1, 12% 和 2, 8.8%)。在甲基 α-
D-吡喃葡萄糖苷的情况下,产物 3 (8.6%) 和 4 (8.0%) 分别是 1 和 2 的对映体。在
甲苯中用三丁基氢化
锡对 1 或 3 进行脱氮氢化反应生成 3-deoxy-3-C-methyl-β-D-pyranosides (gluco, 5, 61% and allo, 6, 22%) 或 L-pyranosides (gluco, 9 , 65% 和 allo, 10, 19%),分别。该反应顺序是合成 3-脱氧-3-C-甲基-L-
葡萄糖和-
L-阿洛糖的新方法。2 或 4 的脱氮加氢生成 3-脱氧-3-C-甲基-α-L-
吡喃糖苷(allo