2-DICHLOROMETHYL-1,3-DIOXOLAN-2-YL ORTHOESTERS. A POTENTIAL PROTECTING GROUP FOR SUGAR DERIVATIVES
作者:H. Özgener、L. Yüceer
DOI:10.1081/car-120016854
日期:——
with acetal protected sugar derivatives in neutral media gave 2-dichloromethyl-1,3-dioxolan-2-yl orthoesters. These orthoesters are readily hydrolysed under mild acidic conditions offering a new method for the preparation of readily removable protecting groups. This strategy was realised in the preparation of 6-O-acetyl-3,5-di-O-methyl-1,2-O-isopropylidene-α-d-glucofuranose.
2-二氯亚甲基-1,3-二氧戊环(2)与乙缩醛保护的糖衍生物在中性介质中的反应得到2-二氯甲基-1,3-二氧戊环-2-基原酸酯。这些原酸酯在温和的酸性条件下容易水解,为制备易于除去的保护基提供了一种新方法。在制备6-O-乙酰基-3,5-二-O-甲基-1,2-O-异亚丙基-α-d-葡萄糖呋喃糖中实现了该策略。