N-bromobutanimide → HCID 58551010, compound

Participants

Reaction Conditions

Reaction Steps

To tert-butyl spiro[piperidine-4,4′-pyrrolo[2,1-c][1,4]benzoxazine]-1-carboxylate (13.2 g, 38.8 mmol) in CH2Cl2 (125 mL) at 0° C. was added NBS (7.25 g, 40.7 mmol) in CH2Cl2 (25 mL) dropwise over 10 min. The mixture was stirred at 0° C. for 5 min before it was diluted with 200 mL of 0.5M Na2S2O3. The aqueous phase was removed and the organic phase was washed with 200 mL of brine. The organic phase was separated, dried over MgSO4, filtered and concentrated in vacuo. The residue was purified by column chromatography (0-30% EtOAc/hexanes) to give tert-butyl 1-bromospiro[benzo[b]pyrrolo[1,2-d][1,4]oxazine-4,4′-piperidine]-1′-carboxylate. ESI-MS m/z calc. 418.1. found 419.0 (M+1)+; Retention time: 2.29 minutes (3 min run).

Provenance & Evidence