Potassium Hydroxide → HCID 178466130, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 6,7-dimethoxy-1-methylisoquinolin-3-ol CCH 18060 (51 mg, 233 μmol) in toluene (15 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added a 2 N aq. KOH solution (0.22 mL, 0.44 mmol) at RT followed by CCH 29192 (50 mg, 194 μmol) and the mixture was stirred at 150° C. for 1.5 h under microwave irradiation. After cooling to RT, the mixture was diluted with H2O (10 mL) before extraction with EtOAc (50 mL). The organic layer was isolated and the aqueous layer was further extracted with CH2Cl2 (50 mL). Both organic layers were washed with brine (10 mL), combined, dried over Na2SO4, filtered and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 94:6) gave 4-((5-ethoxyquinolin-3-yl)methyl)-6,7-dimethoxy-1-methylisoquinolin-3-ol. This free base was dissolved in MeOH (2 mL) in a 10 mL round-bottomed flask equipped with a magnetic stirrer before addition of a 0.09 M HCl solution in MeOH (2 mL). The reaction mixture was stirred for 5 min at RT and concentrated at 40° C. under vacuum to afford 4-((5-ethoxyquinolin-3-yl)methyl)-6,7-dimethoxy-1-methylisoquinolin-3-ol dihydrochloride 28 as a yellow solid (11 mg, 12% yield).

Provenance & Evidence