tert-butyl 6-bromo-4-oxo-3,4-dihydro-1'H-spiro[1,3-benzoxazine-2,4'-piperidine]-1'-carboxylate6-Bromospiro[1,3-benzoxazine-2,4'-piperidine]-4(3H)-one, N-BOC protected 95%tert-Butyl 6-bromo-3,4-dihydro-4-oxo-1'H-spiro[1,3-benzoxazine-2,4'-piperidine]-1'-carboxylate