N-Glycopeptide mimetic with N-glycosylated isoasparagine and isoglutamine conjugates were synthesized by regioselective opening of unsymmetrical cyclic anhydride derivatives of L-aspartic acid and L-glutamic acid, using per-O-acetylated β-D-glycopyranosyl amine. The α-chloro derivative gave a mixture of asparagine and isoasparagine linked glycoconjugates, whereas the trifluoroacetamide derivatives gave predominantly the isoasparagine and isoglutamine linked glycoconjugates as the product. The X-ray crystal structure of the α-chloro isoasparagine linked glycoconjugate showed unique pattern of hydrogen bonding.
通过使用过-O-乙酰化β-D-吡喃糖基胺,对 L-天冬氨酸和 L-谷氨酸的不对称环酐衍生物进行区域选择性开环,合成了具有 N-糖基化异天冬酰胺和异谷氨酰胺共轭物的 N-糖肽模拟物。α-氯衍生物生成天冬酰胺和异天冬酰胺连接的糖苷酸混合物,而三氟乙酰胺衍生物则主要生成异天冬酰胺和异谷氨酰胺连接的糖苷酸。α-氯异天冬酰胺连接糖结合物的 X 射线晶体结构显示出独特的氢键模式。