One-flask synthesis of triacetalated aldohexoses with 2,2-dialkoxypropane and p-toluenesulfonic acid
作者:Makoto Kiso、Akihiro Kondo、Yumi Kondo、Akira Hasegawa
DOI:10.1016/0008-6215(84)85110-1
日期:1984.4
- arabino -hexose and some N -protected 2-amino-2-deoxy- d -glucose derivatives were each treated with 2,2-dimethoxy- or 2,2-dibenzyloxy-propane in 1,4-dioxane in the presence of p -toluenesulfonic acid at 60–70°. The major products were acyclic, dimethyl and dibenzyl acetals of 2-deoxy-3,4:5,6-di- O -isopropylidene- aldehydo - d - arabino -hexose or of N -protected 2-amino-2-deoxy-3,4:5,6-di- O -isopropylidene-
摘要将2-脱氧-d-阿拉伯糖己糖和一些N-保护的2-氨基-2-脱氧-d-葡萄糖衍生物分别在1,4-中用2,2-二甲氧基或2,2-二苄氧基丙烷处理。在对甲苯磺酸存在下于60–70°下形成二恶烷。主要产物是2-脱氧-3,4:5,6-二-O-异亚丙基-醛-d-阿拉伯糖-己糖或N-保护的2-氨基-2-脱氧-3的无环,二甲基和二苄基缩醛,4:5,6-二-O-异亚丙基-醛-d-葡萄糖。一些二苄基乙缩醛以良好的产率转化为相应的3,4:5,6-二-O-异亚丙基-醛-d-己糖。