Bromine → HCID 53933001, compound

Participants

Reaction Steps

A solution of the ketone intermediate from Step 2 (2.05 g, 7.4 mmol) in acetic acid (30 mL) and 33% HBr in acetic acid (0.5 mL) was treated with a 0.99M solution of bromine in acetic acid (7.6 mL, 7.5 mmol) and stirred at room temperature for 1 hour. The solution was concentrated in vacuo and the residue was taken up in dichloromethane, washed with 1N NaHSO3, brine, dried over anhydrous MgSO4, filtered, and concentrated in vacuo to give a brown solid (2.39 g, 90%) that was unstable and used directly in the next step without further purification. 1H NMR (CDCl3) 300 MHz 7.94 (q, J=6.3 Hz, 1H), 7.37 (d, J=8.5 Hz, 2H), 7.21 (d, J=8.5 Hz, 2H), 6.97 (m, 1H), 6.84 (m, 1H), 6.28 (s, 1H), 2.46 (s, 3H); 19F NMR (CDCl3) -100.31 (m), -103.50 (m). Mass spectrum: M+H=358.

Provenance & Evidence