tert-butyl {1-[2-(6-cyano-3-oxo-2,3-dihydro-4H-1,4-benzoxazin-4-yl)ethyl]-2-oxopiperidin-4-yl}carbamate 、 1-[2-(4-aminopiperidin-1-yl)ethyl]-7-methoxy-1,4-dihydro-2H-3,1-benzoxazin-2-one trifluoroacetate 以The crude trifluoro acetate of the title compound was obtained as a red oil, 232 mg (quantitative)的产率得到