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To a stirred solution of isoquinolin-4-carbonitrile (Intermediate-13) (3.0 g, 19.45 mmol) in EtOH (30 mL) was added KOH (20 g in 20 mL water) and the mixture was refluxed overnight. It was then cooled to RT and concentrated under reduced pressure. The aqueous layer was washed with Et2O and neutralized using 1N HCl. It was extracted with EtOAc and the organic layer was dried over Na2SO4, filtered, and concentrated to give the title compound (2 g, 59.3percent) as an off white solid.
59.3%
Reflux
lntermediate-14: lsoquinolin-4-carboxylic acid: To a stirred solution of isoquinolin-4-carbonitrile (lntermediate-13) (3.0 g, 19.45 mmol) in EtOH (30 mL) was added KOH (20 g in 20 mL water) and the mixture was refluxed overnight. It was then cooled to RT and concentrated under reduced pressure. The aqueous layer was washed with Et20 and neutralized using 1 N HCI. It was extracted with EtOAc and the organic layer was dried over Na2S04, filtered, and concentrated to give the title compound (2 g, 59.3percent) as an off white solid.
Reference：
[1] Patent: US2013/178457, 2013, A1, . Location in patent: Paragraph 0221
[2] Patent: WO2013/5168, 2013, A2, . Location in patent: Page/Page column 40
[3] Journal of the American Chemical Society, 1940, vol. 62, p. 3030
[4] Journal of the American Chemical Society, 1939, vol. 61, p. 183
[5] Archiv der Pharmazie, 2003, vol. 336, # 4-5, p. 258 - 263
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