L-Isoserine → 3-[(1-Cyano-4-hydroxy-7-phenoxy-isoquinoline-3-carbonyl)-amino]-2-(S)-hydroxy-propionic acid

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Reaction Steps

A mixture of 1-cyano-4-hydroxy-7-phenoxy-isoquinoline-3-carboxylic acid methyl ester (100 mg, 0.31 mmol) and 3-amino-2-(S)-hydroxy-propionic acid (99 mg, 0.94 mmol) (Sigma-Aldrich) in 0.5 M NaOMe/MeOH (1.25 mL, 0.63 mmol) was microwaved at 120° C. for 1 h. Reaction mixture was concentrated and the residue was dissolved in water (70 mL). It was acidified by 1 N HCl to pH=3-4 and then extracted with EtOAc. Organic layer was washed with brine, dried over MgSO4, filtered and concentrated to provide the title compound 113 mg (0.29 mmol) in 93% yield. LC-MS ESI−: 391.98 (M−1)−.

Provenance & Evidence