2,4,6-Trimethylpyridine → HCID 22145733, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-fluoro-5-isopropoxy-4-methoxybenzoic acid (7.2 g) and lithium iodide (24 g) in collidine (120 mL) is heated at 150° C. overnight, cooled and dissolved in 2 N sodium hydroxide (200 mL) and washed with ethyl acetate (3×150 mL). The aqueous solution is acidified to pH 1 with concentrated hydrochloric acid and extracted with ethyl acetate (3×100 mL). The combined organic layers are dried (magnesium sulfate) and concentrated to give an oil. The oil is subjected to mplc on silica gel using petroleum ether: ethyl acetate (2:1 v/v) as eluent to give 2-fluoro-4-hydroxy-5-isopropylbenzoic acid (5.7 g). [NMR (DMSO):— 7.32 (d, 1H, J=8 Hz), 6.67 (d, 1H, J=12 Hz), 4.47 (m, 1H), 1.24 (d, 6H, J=6 Hz)].

Provenance & Evidence