Action of strongly basic reagents on methyl Nα-benzyloxycarbonylamino-γ-bromobutyrate leads to 1-aminocyclopropanecarboxylic acid derivatives whose structure was determined by 1H NMR, 13C NMR and IR spectroscopy. According to IR spectroscopy, the urethane CO-NH group in crystalline methyl 1-benzyloxycarbonylaminocyclopropanecarboxylate exists in the cis(E) conformation which on dissolution is transformed into the trans(Z) form. NMR spectroscopy showed that the acid-catalyzed esterification of α-amino-γ-bromobutyric acid is accompanied by replacement of the covalently bonded bromine by chlorine.
强碱试剂作用于甲基Nα-苄氧羰基
氨基-γ-
溴丁酸酯,得到1-
氨基环丙
氨基甲酸衍
生物,其结构由1H NMR、13C NMR和IR光谱确定。根据IR光谱,结晶态甲基1-苄氧羰基
氨基环丙
氨基甲酸酯中的
尿素CO-NH基团存在于cis(E)构象,溶解后转变为trans(Z)形式。NMR光谱显示,α-
氨基-γ-
溴丁酸酸催化酯化伴随着共价键结合的
溴原子被
氯原子取代。