1-Bromo-3-chloropropane → 1-(3-Chloropropyl)-3,3-dimethylindolin-2-one

Participants

Reaction Steps

A solution of 3,3-dimethylindolin-2-one (1.843 g, 11.43 mmol, 1 equiv) in N,N-dimethylformamide was cooled to 0° C. Sodium hydride (60% dispersion) (503 mg, 12.58 mmol, 1.1 equiv) was slowly added and the reaction was stirred as such until all bubbling had stopped. 1-bromo-3-chloropropane (3.37 ml, 34.3 mmol, 3 equiv) was added to the reaction mixture in one portion. The reaction was allowed to warm to ambient temperature and stirred as such for 16 h. The crude mixture was partitioned between ethyl acetate and water. The organic layer was dried over MgSO4, filtered, concentrated, and the residue was purified using the Biotage flash chromatography system (SNAP 50 g cartridge, Rf=0.5, gradient—5%-30% ethyl acetate in hexanes) to afford the title compound as a light orange oil (2.38 g, 87%); 1H NMR (400 MHz, DMSO-d6): δ 1.26 (s, 6H); 1.98-2.14 (m, 2H); 3.65 (t, 2H, J=6 and 6.8 Hz); 3.77-3.81 (m, 2H); 7.02-7.07 (m, 2H); 7.24-7.28 (m, 1H); 7.33-7.35 (m, 1H); MS for C13H16ClNO m/z 237.99 (M+H)+.

Provenance & Evidence