Dibromomethane → 3-(5-Chloro-2-methoxy-benzenesulfonyl)-2,3-dihydro-benzooxazole-5-carboxylic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

Potassium carbonate (3.87 g, 28.0 mmol) was added to a solution of 3-(5-chloro-2-methoxy-benzenesulfonylamino)-4-hydroxy-benzoic acid methyl ester (2.08 g, 5.59 mmol) and dibromomethane (2.92 g, 16.5 mmol) in N,N-dimethylformamide (35 mL), and the suspension was heated at 80° C. for 48 h, then the reaction mixture was partitioned between water and dichloromethane. The organic layer was washed with brine, dried (MgSO4), and evaporated. Chromatography (SiO2, heptane-ethyl acetate gradient) produced 3-(5-chloro-2-methoxy-benzenesulfonyl)-2,3-dihydro-benzooxazole-5-carboxylic acid methyl ester (2.13 g, 99%). White solid, MS (ISP)=384.1 (M+H)+.

Provenance & Evidence