421551-82-8

103261-68-3

421551-82-8

B) Synthesis of methyl 2-(bromomethyl)-5-cyanobenzoate Methyl 5-cyano-2-methylbenzoate (8.9 g), N-bromosuccinimide (9.5 g), 2,2'-azobis(isobutyronitrile) (0.83 g) were mixed with (trifluoromethyl)benzene (200 mL) and the reaction was stirred for 6 hours at 80 °C under nitrogen protection. Upon completion of the reaction, the mixture was poured into water, the organic layer was separated and dried over anhydrous sodium sulfate, and subsequently concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate) to afford the target product methyl 2-(bromomethyl)-5-cyanobenzoate (8.05 g). The product was characterized by 1H NMR (300 MHz, CDCl3) with chemical shifts of δ3.98 (3H, s), 4.96 (2H, s), 7.61 (1H, d, J = 7.9 Hz), 7.77 (1H, dd, J = 7.9,1.9 Hz), 8.27 (1H, d, J = 1.9 Hz).