Three hexopyranosides having gem-di-C-methyl group at 2- or 4-positions were synthesized by Michael addition to 2-enopyranosid-4-ulose and 3-enopyranosid-2-ulose derivatives, respectively, followed by hydroboration. A heptopyranosid-6-ulose having gem-di-C-methyl group at C–4 was also synthesized from 4-enopyranosid-6-ulose derivative in a similar way.
2-enopyranosid-4-ulose 和 3-enopyranosid-2-ulose 衍
生物分别通过迈克尔加成法合成了三种在 2 位或 4 位具有 gem-di-C- 甲基的六
吡喃糖苷,然后进行了
硼氢化反应。此外,还以类似的方法从 4-烯
吡喃糖苷-6-乌洛糖衍
生物合成了 C-4 位具有 gem-di-C- 甲基的庚
吡喃糖苷-6-乌洛糖。