7,8-difluoro-2,3-dihydro-4H-1,4-benzoxazine

2-(2-bromoethoxy)-3,4-difluoroaniline

2-(2-bromoethoxy)-3,4-difluoronitrobenzene

ethyl 9,10-difluoro-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylate