1-Bromo-3-chlorobenzene → Tert-butyl 3-(3-chlorophenyl)-3-oxopropyl(methyl)carbamate

Participants

Reaction Steps

A solution of 1-bromo-3-chloro-benzene (57 g, 0.3 mmol) in dry THF (300 mL) was added drop wise to Mg (10.8 g, 0.45 mmol) at room temperature under N2. The mixture was stirred at refluxed for 1 h. The Grignard reagent was added drop wise to a solution of tert-butyl 3-(methoxy(methyl)amino)-3-oxopropyl(methyl)carbamate (37 g, 0.15 mmol) in dry THF (300 mL) at −78° C. After addition, the mixture was allowed to stir at room temperature overnight. The mixture was quenched with saturated NH4Cl and extracted with ethyl acetate. The combined organic layers were washed with brine, dried over Na2SO4 and concentrated in vacuo to give the crude product, which was purified through column chromatography. 1H NMR (CDCl3, 400 MHz) δ 1.42 (s, 9H), 2.89 (s, 3H), 3.18 (m, 2H), 3.62 (t, 2H), 7.42 (m, 1H), 7.52 (m, 1H), 7.82 (m, 1H), 7.91 (m, 1H).

Provenance & Evidence