ethyl 5-amino-1-(2,3;5,6-di-O-isopropylidene-α,β-D-mannofuranosyl)imidazole-4-carboxylate 在
盐酸 、
copper(l) chloride 、 sodium nitrite 作用下,
生成 ethyl 5-chloro-1-(2,3-O-isopropylidene-α-D-mannofuranosyl)imidazole-4-carboxylate 、
ethyl 5-chloro-1-(2,3-O-isopropylidene-β-D-mannofuranosyl)imidazole-4-carboxylate