peracetylated alkyl and aryl 1,2-trans-glycosides with iodine in the presence of HMDS has been found to result in the anomerization leading to the formation of the respective 1,2-cis-glycosides. In the case of alkyl glycosides with aglycons of short alkyl chain length complete anomerization to the alpha-glycosides was observed while with those of longer chain length the process was found to be incomplete
已经发现在
HMDS存在下用
碘处理过乙酰化的烷基和芳基1,2-反式-糖苷会导致异构化,从而导致形成相应的1,2-顺式-糖苷。在具有短烷基链长的糖苷配基的烷基糖苷的情况下,观察到完全糖化为α-糖苷,而对于那些具有较长链长的糖苷,发现该过程是不完全的。这些观察已被机械地解释了。