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0 °C

To a solution of isoquinoline-6-carbaldehyde (2.48 g, 15.8 mmol) (prepared as shown in Example 6) in 160 mL of 1:2 EtOH:H2O was added hydroxylamine hydrochloride (1.21 g, 17.4 mmol). The mixture was cooled to 0° C., and 50 wt % NaOH in H2O (3.2 mL, 0.2 mL per mmol of aldehyde) was added dropwise. The mixture was then stirred at 0° C. for 2 hours, at which time the pH was adjusted to about 6 with 10% aqueous HCl. The resulting biphasic mixture was then transferred to a separatory funnel and extracted five times with 150 mL of DCM. The combined organic layers were dried over MgSO4. Concentration under reduced pressure afforded (E)-isoquinoline-6-carbaldehyde oxime (2.14 g, 78.8% yield) as a white solid. 1H NMR (400 MHz, CD3OD) δ ppm 9.20 (s, 1H), 8.44 (d, J=5.9 Hz, 1H), 8.28 (s, 1H), 8.06 (s, 2H), 7.99 (s, 1H), 7.83 (s, 5.9 Hz, 1H).

1. customThe resulting biphasic mixture was then transferred to a separatory funnel
2. extractionextracted five times with 150 mL of DCM
3. dry with materialThe combined organic layers were dried over MgSO4
4. concentrationConcentration under reduced pressure