Anomalous Zemplén deacylation reactions of 2-O-acyl-3-O-alkyl or -3-O-glycosyl derivatives of d-galactose and d-glucose: synthesis of O-α-d-mannopyranosyl-(1→4)-O-α-l-rhamnopyranosyl-(1→3)-d-galactose and an intermediate for the preparation of 2-O-glycosyl-3-O-(α-d-mannopyranosyl)-d-glucoses
作者:Zoltán Szurmai、András Lipták、Günther Snatzke
DOI:10.1016/0008-6215(90)84191-v
日期:1990.4
conditions (catalytic amount of sodium methoxide in methanol) gave partially deacylated disaccharides in which the 2- O -acyl groups were retained. Likewise, a similar result was obtained with the β- l -rhamnopyranosyl analogue ( 3 ) of 1 . This anomalous reaction was used in a synthesis of the title trisaccharide ( 17 ) and of methyl 4,6- O -benzylidene-3- O -(2,3:4,6-di- O -isopropylidene-α- d -mannopyranosyl)-α-
摘要4,6-O-亚苄基-3-O-(2,3,4-三-O-乙酰基-α-苄基的2-O-苯甲酰基(1)和2-O-乙酰基(5)衍生物的处理1-Zrhamnopyranosyl)-β-d-吡喃半乳糖苷在Zemplen条件下(催化量的甲醇钠在甲醇中的催化量)得到部分脱酰基的二糖,其中保留了2-O-酰基。同样,β-1-鼠李糖基吡喃糖基类似物(3)为1时也获得了相似的结果。该异常反应用于标题三糖(17)和甲基4,6-O-亚苄基-3-O-(2,3:4,6-二-O-异亚丙基-α-d-甘露吡喃糖基的合成中)-α-d-吡喃葡萄糖苷,一种用于合成2-O-糖基-3-O-(α-d-甘露吡喃糖基)-d-葡萄糖的中间体。