Hydrochloric Acid → (R)-2-(5-((S)-2-(4-Chlorophenyl)propanamido)-1-oxoisoquinolin-2(1H)-yl)-3-methylbutanoic acid

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Reaction Steps

(R)-methyl 2-(5-((S)-2-(4-chlorophenyl)propanamido)-1-oxoisoquinolin-2(1H)-yl)-3-methylbutanoate (0.43 g, 0.00088 mol) was stirred with lithium hydroxide (0.05 g, 0.002 mol) in tert-butyl alcohol (6 mL, 0.06 mol) and water (3 mL, 0.2 mol) at 0° C. for 1 hour. 1 N HCl was added until pH<7 and then reaction mixture was extracted with CH2Cl2 (40 mL×3). The organic layers were dried over MgSO4, filtered, purified via flash chromatography (12 g of silica gel, 0-50% EtOAc/Hexane) and gave a light yellow solid. 1H NMR δ (CDCl3) δ: 8.17 (br, 1H), 7.86 (br, 1H), 7.52-7.29 (m, 6H), 7.03 (br, 1H), 6.09-6.05 (m, 1H), 5.00-4.87 (m, 1H), 3.87-3.82 (m, 1H), 2.70-2.60 (m, 1H), 1.64 (d, J=7.0 Hz, 3H), 1.14 (d, J=6.5 Hz, 3H), 0.78 (d, J=6.4 Hz, 3H). MS m/z 427.1 (M+H)+.

Provenance & Evidence