Potassium Hydroxide → HCID 178486670, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 6,7-dimethoxy-1-methylisoquinolin-3-ol CCH 18060 (197 mg, 899 μmol) in toluene (10 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added a 2 N aq. KOH solution (1.20 mL, 2.40 mmol) at RT followed by 4-(bromomethyl)pyridine hydrobromide (250 mg, 988 μmol) and the mixture was stirred at 110° C. for 15 min under microwave irradiation. After cooling to RT, the mixture was diluted with H2O (5 mL) before extraction with CH2Cl2 (50 mL). The organic layer was washed with brine (10 mL), dried over Na2SO4, filtered and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 90:10) gave 70 mg of 6,7-dimethoxy-1-methyl-4-(pyridin-4-ylmethyl)isoquinolin-3-ol as a yellow solid. This free base was dissolved in MeOH (5 mL) in a 25 mL round-bottomed flask equipped with a magnetic stirrer before addition of a 0.15 M HCl solution in MeOH (7 mL). The reaction mixture was stirred for 5 min at RT and concentrated at 40° C. under vacuum to afford 6,7-dimethoxy-1-methyl-4-(pyridin-4-ylmethyl)isoquinolin-3-ol hydrochloride 11 as a yellow solid (78 mg, 25% yield).

Provenance & Evidence