Hydrochloric Acid → 3-(1-Cyano-4-hydroxy-7-(4methoxyphenoxy)isoquinoline-3-carboxamido)-3-methylbutanoic acid

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A mixture of 1-cyano-4-hydroxy-7-(4-methoxy-phenoxy)-isoquinoline-3-carboxylic acid methyl ester (100 mg) and 3-amino-3-methyl-butyric acid (100 mg) and NaOMe (45 mg) in DMA (1.5 mL) was microwaved at 150° C. for 3 h. The mixture was cooled, diluted with water, acidified with 2 M HCl solution, solids were collected with filtration, washed with water, air dried then the residue was further column purified to give the desired product (27 mg). LC MS ESI+: 436 (M+1)+.

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