Lithium Hydroxide → HCID 178437773, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 1-ethyl-6,7-dimethoxyisoquinolin-3-ol SLA 28136 (70 mg, 0.30 mmol) in THF (10 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added N-benzyl-3-(chloromethyl)-6-methoxyquinolin-2-amine hydrochloride SLA 41008 (105 mg, 0.30 mmol) followed by a 2 N aq. LiOH (0.30 mL, 0.60 mmol) and the mixture was stirred at 160° C. for 1.5 h under microwave irradiation. After cooling to RT, the mixture was diluted with CH2Cl2:MeOH=9:1 (150 mL), washed with brine (20 mL), dried over Na2SO4, filtered, and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 97:3) provided, after evaporation, 17.3 mg of 4-((2-(benzylamino)-6-methoxyquinolin-3-yl)methyl)-1-ethyl-6,7-dimethoxyisoquinolin-3-ol as a brown solid. This free base was dissolved in CH2Cl2 (2 mL) in a 10 mL round-bottomed flask equipped with a magnetic stirrer before addition of a 0.49 M HCl solution in MeOH (0.28 mL). The reaction mixture was stirred for 5 min at RT then concentrated at 40° C. under vacuum to afford 4-((2-(benzylamino)-6-methoxyquinolin-3-yl)methyl)-1-ethyl-6,7-dimethoxyisoquinolin-3-ol dihydrochloride 44 as a yellow solid (16 mg, 9% yield).

Provenance & Evidence