1: 2,4-dioxo-1,4-dihydro-2H-benzo[d][1,3]oxazine With sodium hydride in N,N-dimethyl-formamide 1 h; 2: n-bromopentane in N,N-dimethyl-formamide 24 h;

1: 2,4-dioxo-1,4-dihydro-2H-benzo[d][1,3]oxazine With sodium hydride in N,N-dimethyl-formamide T=20°C; 1 h; Cooling with ice; 2: n-amyl iodide in N,N-dimethyl-formamide T=20°C; 2 h;

(i) NaH, AcNMe2, (ii) n-pentyl halide; Multistep reaction;