Hydrochloric Acid → 3{-[1-Cyano-7-(4-fluoro-phenoxy)-4-hydroxy-isoquinoline-3-carbonyl]-amino}-2,2-dimethyl-propionic acid

Participants

Reaction Steps

A mixture of 1-cyano-7-(4-fluoro-phenoxy)-4-hydroxy-isoquinoline-3-carboxylic acid butyl ester (80 mg, 0.21 mmol) (prepared according to U.S. Pat. No. 7,928,120) and 3-Amino-2,2-dimethyl-propionic acid tert-butyl ester (71 mg, 0.41 mmol) in MeOH (1.5 mL) was microwaved at 120° C. For 1 h. Reaction mixture was diluted with water (80 mL), acidified by 1 N HCl and then extracted with EtOAc. Organic layer was washed with brine, dried over MgSO4, filtered and concentrated. Residue was then treated with 3 mL of (½) TFA/CH2Cl2. Resultant mixture was stirred at room temperature for 5 h and concentrated to provide the title compound 90 mg (0.21 mmol) in 100% yield. LC-MS ESI−: 422.07 (M−1)−.

Provenance & Evidence