4-Bromoaniline → Ethyl 3-(4-bromophenylamino)-2-(methylsulfonyl)acrylate

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 2-(methylsulfonyl)acetate (1.9 g, 11.4 mmol), triethyl orthoformate (5.64 mL, 34.2 mmol), and acetic anhydride (5 mL) were heated at 130° C. for 5 h with a Dean Stark trap. The reaction was cooled, 4-bromoaniline (3.1 g, 18.0 mmol) was added and the reaction mixture was heated at 150° C. for 2 h. The reaction mixture was cooled, concentrated and the residue was purified by column chromatography to afford the desire product (1.08 g, 27% over 2 steps) as a tan solid: 1H NMR (300 MHz, CDCl3) δ 10.58 (d, J=13.5 Hz, 1H), 8.39 (d, J=13.7 Hz, 1H), 7.59-7.48 (m, 2H), 7.15-7.02 (m, 2H), 4.41 (q, 1=7.1 Hz, 2H), 3.19 (s, 3H), 1.43 (t, J=7.1 Hz, 3H).

Provenance & Evidence