Lithium Hydroxide → HCID 178440215, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 6,7-dimethoxy-1-propylisoquinolin-3-ol RBO 35142 (245 mg, 0.99 mmol) in toluene (10 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added a 2 N aq. LiOH solution (1.00 mL, 2.00 mmol) at RT followed by 7-(chloromethyl)-N-methyl-[1,3]dioxolo[4,5-g]quinolin-6-amine hydrochloride CCH 34158B (284 mg, 0.99 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 (80 mL) and the organic solution was washed with brine (10 mL), dried over Na2SO4, filtered and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent CH2Cl2:7 N NH3 solution in MeOH=100:0 to 95:5) gave, after evaporation, 6,7-dimethoxy-4-((6-(methylamino)-[1,3]dioxolo[4,5-g]quinolin-7-yl)methyl)-1-propylisoquinolin-3-ol. This free base was dissolved in MeOH (3 mL) in a 10 mL round-bottomed flask equipped with a magnetic stirrer before addition of a 0.19 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 6,7-dimethoxy-4-((6-(methylamino)-[1,3]dioxolo[4,5-g]quinolin-7-yl)methyl)-1-propylisoquinolin-3-ol dihydrochloride 62 as a beige solid (46 mg, 9% yield).

Provenance & Evidence