作者:Yoshimitsu Ueno、Kohsuke Hori、Ryo Yamauchi、Makoto Kiso、Akira Hasegawa、Koji Kato
DOI:10.1016/s0008-6215(00)85252-0
日期:1981.3
presence of a trace of p -toluenesulfonic acid, and 1,2:4′,6′-di- O -isopropylidene-α-maltose and 2,3:5,6-di- O -isopropylidene-4- O -(4′,6′- O -isopropylidene-α- d -glucopyranosyl)- aldehydo - d -glucose dimethyl acetal with an excess of the acid. On the other hand, when 1,4-dioxane was used as the solvent, the 2,3:5,6:4′,6′-tri- O -isopropylidene dimethyl acetal derivative ( 14 ) was obtained in the presence
摘要室温下,在含N,N-二甲基甲酰胺,过量的对甲苯磺酸中用2,2-二甲氧基丙烷对麦芽糖进行乙酰化,得到1,2-O-异亚丙基-α-麦芽糖,4-O-α-d-吡喃葡萄糖基-2,3:5,6-二-O-异亚丙基-d-葡萄糖醛,1,2:4',6'-二-O-异亚丙基-α-麦芽糖和1,6:3,2': 4′,6′-三-O-异亚丙基-β-麦芽糖。当该反应在80°下进行时,在痕量对甲苯磺酸的存在下形成4',6'-O-异亚丙基麦芽糖和3,2':4',6'-二-O-异亚丙基麦芽糖。 1,2:4',6'-二-O-异亚丙基-α-麦芽糖和2,3:5,6-二-O-异亚丙基-4-O-(4',6'-O-异亚丙基-α -d-葡萄糖吡喃糖基)-醛-d-葡萄糖二甲基乙缩醛与过量的酸。另一方面,当使用1,4-二恶烷作为溶剂时,2,3:5,6:4'