4-[4-(2-amino-phenyl)-oxazol-2-yl]-butyric acid 、
3-[4-(2-amino-phenyl)-oxazol-2-yl]-propionic acid methyl ester 在
silica gel 作用下,
以gives 3-[4-(2-amino-phenyl)-oxazol-2-yl]-propionic acid (3.84 g, 85%) after chromatography over silica gel (MeOH/CH2Cl2)的产率得到3-[4-(2-amino-phenyl)-oxazol-2-yl]-propionic acid