to five types of mono-, bis-, and tris(isopropylidene)acetals, among which the 3,4-0-iso-propylidene-6-0-(2-methoxyisopropyl) derivatives can be obtained in high yield and be useful intermediates for selective syntheses of 2-, 6-, and 2,6-0-substituted galactose derivatives.
几种α-和β-
吡喃半
乳糖苷与
2,2-二甲氧基丙烷反应生成多达五种类型的单,双和三(异亚丙基)
乙缩醛,其中3,4-0-异亚丙基-6-0 -(2-甲氧基异丙基)衍
生物可以高产率获得,并且是用于选择性合成2-,6-和2,6-0-取代的半
乳糖衍
生物的有用的中间体。