Potassium Hydroxide → 5-Bromoisoquinoline-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of methyl 5-bromoisoquinolin-4-carboxylate (Intermediate-16) (10.1 g, 38.0 mmol) in MeOH (50 mL) was added, KOH (21.3 g, 380 mmol) dissolved in water (50 mL) and the reaction mixture was heated to 70° C. for 3 h. Then it was concentrated, diluted with water and washed with Et2O (100 mL×3). The aqueous layer was acidified with 2N HCl (pH=3) and the white solid obtained was filtered to yield the desired acid derivative 6.0 g (62.7%).

Provenance & Evidence