3-(6-(4-(1-aminocyclobutyl)phenyl)-2-oxo-7-phenyl-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-1-yl)propanenitrile 、 (R)-tert-butyl(1-(4-(1,3-dimethyl-2-oxo-7-phenyl-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-6-yl)phenyl)cyclobutyl)carbamate 以to afford the title compound (6.5 mg)的产率得到6-(4-(1-aminocyclobutyl)phenyl)-1,3-dimethyl-7-phenyl-1H-pyrido[2,3-b][1,4]oxazin-2(3H)-one