作者:Mikhail Kim、Barbara Grzeszczyk、Aleksander Zamojski
DOI:10.1016/s0040-4020(00)00847-4
日期:2000.11
hexodialdo-1,5-pyranosides were reacted with four Grignard C1 reagents: methoxymethyl-, allyloxymethyl-, benzyloxymethyl, and dimethylphenylsilylmethyl-magnesium chlorides. Two stereoisomeric heptoses were obtained in each case in a good yield. The methyl alloside-derived heptosides were accompanied by C-5 inverted products. The addition of Grignard reagents to aldehydes 5–8 has been discussed in terms
使三种立体异构体己二醛-1,5-吡喃糖苷的衍生物与四种格氏试剂C 1反应:甲氧基甲基氯化物,烯丙氧基甲基氯化物,苄氧基甲基氯化物和二甲基苯基甲硅烷基甲基氯化镁。在每种情况下均以良好的产率获得了两种立体异构的庚糖。甲基同种异体甙衍生的庚糖甙伴随有C-5倒置产物。成醛添加格氏试剂5 - 8在平行α-或β-螯合和Felkin-映过渡态的形式进行了讨论。已经发现,甲硅烷基格氏试剂12对于在C-6处形成l-构型的庚糖衍生物表现出强烈的偏好。