1-Bromo-3-chloropropane → HCID 57281530, compound

Participants

Reaction Steps

To a solution of (2S,4S)-N-ethyl-6-fluoro-2',5'-dioxospiro[chroman-4,4'-imidazolidine]-2-carboxamide (21.0 g, 68.4 mmol) in N,N-dimethylformamide (100 ml, 1.29 mmol) was added 1-bromo-3-chloropropane (21.5 g, 137 mmol). After adding 60% NaH (2.75 g, 68.8 mmol) over 30 minutes at 15°-20° C., the mixture was stirred for 15 hours at 15°-25° C. The reaction mixture was poured into iced water (500 ml), extracted with AcOEt (1000 ml×3), dried over MgSO4. The solvent was distilled off, the residue was chromatographed on silica gel, eluted with CH2Cl2 -CH2Cl2 /MeOH (9/1), and recrystallized from AcOEt to give the desired compound (19.3 g, 73.8%) as colorless prism crystals.

Provenance & Evidence