Acetic Acid → HCID 11747443, compound

Participants

Reaction Steps

To a stirring solution of 20c (2.07 g, 11.34 mmol), carbon tetrachloride (62 ml) and glacial acetic acid (2.07 ml) was added at room temperature a solution of bromine (μL 546.6, 10.66 mmol) in carbon tetrachloride (34 ml). The first drop was added and after 20 minutes the solution was added dropwise in 4 hours. After stirring for 16 hours the solvent was distilled and to the residue was added water and solid sodium bicarbonate (to pH 7), the organic phase was separated and water extracted with dichloromethane (3×30 ml), the organic layers were dried and evaporated. The crude product was chromatographed (70% petroleum ether 40-60° in dichloromethane) to give 1.90 g of 21c as a yellowish solid (64% yield). 1H NMR (CDCl3) δ7.47-7.42 (dd, 1H, J=8.85, 2.84 Hz); 7.38-7.18(m, 2H); 4.42 (s, 2H); 2.43 (s, 3H).

Provenance & Evidence