Lithium hydroxide, monohydrate → 6-(2-dimethylamino-ethoxy)-1-isopropyl-1H-indole-4-carboxylic acid

Participants

Reaction Steps

To a solution of 6-(2-dimethylamino-ethoxy)-1-isopropyl-1H-indole-4-carboxylic acid methyl ester (500 mg, 1.64 mmol) in THF (5 mL) was added LiOH.H2O (200 mg, 4.93 mmol) in water (5 mL). The reaction was heated at reflux for 5 h, at which time the THF was removed under reduced pressure. The remaining mixture was acidified with 1 N HCl (pH ˜6) and extracted with 10% MeOH in chloroform (4×30 mL). The combined organic layer was dried over anhydrous Na2SO4 and concentrated to yield 6-(2-dimethylamino-ethoxy)-1-isopropyl-1H-indole-4-carboxylic acid (400 mg), which was used in the next stage without further purification. LCMS (ES+): m/z=291.30 [M+H].

Provenance & Evidence