Novel sugar acetals such as those of formula
where Ra is hydrocarbyl; Rb and Rc are hydrogen or hydrocarbyl; R3, R4 and R6 are hydrogen or R4 with R3 or R6 is
are made from 1,4-linked reducing disaccharides by a new exchange acetalation process in which the solvent is omitted. The sugar acetals have free hydroxy groups on the ring which groups can be converted to other substituents, e.g. chlorodeoxy or fatty acid acyl. After deprotection the corresponding derivative of the initial disaccharide is obtained.
新型糖醛,如式中的糖醛
其中 Ra 是烃基;Rb 和 Rc 是氢或烃基;R3、R4 和 R6 是氢或 R4 与 R3 或 R6 是
是由 1,4-连接的还原性二糖通过新的交换
缩醛工艺制成的,其中省略了溶剂。糖醛环上有游离的羟基,这些羟基可以转化为其他取代基,如
氯脱氧基或
脂肪酸酰基。经脱保护后,可得到初始二糖的相应衍
生物。