Acetalation of sucrose by acetal exchange with concomitant fission of the glycosidic bond. Some new acetals of<scp>D</scp>-glucose and methyl α-<scp>D</scp>-fructofuranoside
作者:Raul Cortes-Garcia、Leslie Hough、Anthony C. Richardson
DOI:10.1039/p19810003176
日期:——
Prolonged reaction of sucrose with 2,2-dimethoxypropane in NN-dimethylformamide in the presence of toluene-p-sulphonic acid (0.3% w/v) afforded, after acetylation, methyl 4,6-di-O-acetyl-1,3-O-isopropylidene-α-D-fructofuranoside together with four acetals of D-glucose, namely, (1S)-1-methoxy-1,2:3,4:5,6-tri-O-isopropylidene-D-glucitol, 3-O-acetyl-1,2:5,6-di-O-isopropylidene-α-D-glucofuranose, 3-O-acetyl-1
乙酰化后,在甲苯-对-磺酸(0.3%w / v)存在下,蔗糖与2,2-二甲氧基丙烷在NN-二甲基甲酰胺中的长时间反应,得到甲基4,6-二-O-乙酰基-1,3 - ö异亚丙基α- d -fructofuranoside与四个缩醛一起d葡萄糖,即,(1个小号)-1-甲氧基-1,2-:3,4:5,6-三ö异亚丙基d -葡萄糖醇,3 - O-乙酰基-1,2:5,6-二-O-异亚丙基-α - D-葡萄糖呋喃糖,3 - O-乙酰基-1,2:4,6-二-O-异亚丙基-α- d-吡喃葡萄糖和1,2,3-三-O-乙酰基-4,6 - O-异亚丙基-αβ- D-吡喃葡萄糖。讨论了这些化合物的形成机理。甲基α-和β- D-果糖呋喃糖苷的几种衍生物已经由甲基1,3 - O-异亚丙基-α- D-果糖呋喃糖苷制备。