Lithium Hydroxide → HCID 178440229, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 6,7-dimethoxy-1-propylisoquinolin-3-ol RBO 35134 (149 mg, 0.60 mmol) in THF (10 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added 3-(chloromethyl)-6-ethoxy-N-ethylquinolin-2-amine hydrochloride SLA 41042 (181 mg, 0.68 mmol) at RT followed by a 2 N aq. LiOH solution (0.60 mL, 1.20 mmol) and the mixture was stirred at 150° C. for 1.5 h under microwave irradiation. After cooling to RT, the mixture was diluted with CH2Cl2:MeOH=9:1 (150 mL) and washed with brine (20 mL), dried over Na2SO4, filtered, and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent EtOAc:MeOH=100:0 to 95:5) followed by a second purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 97:3) provided 35 mg of 4-((6-ethoxy-2-(ethylamino)quinolin-3-yl)methyl)-6,7-dimethoxy-1-propylisoquinolin-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 (1.0 mL). The reaction mixture was stirred for 5 min at RT then concentrated at 40° C. under vacuum to afford 4-((6-ethoxy-2-(ethylamino)quinolin-3-yl)methyl)-6,7-dimethoxy-1-propylisoquinolin-3-ol dihydrochloride 49 as a yellow solid (14 mg, 4% yield).

Provenance & Evidence