Lithium Hydroxide → HCID 178437771, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-ethyl-6,7-dimethoxyisoquinolin-3-ol SLA 47022 (128 mg, 0.55 mmol) in THF (13 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added N-(2-(3-(chloromethyl)-6-(cyclopropylmethoxy)quinolin-2-ylamino)ethyl)acetamide hydrochloride SLA 47096B (211 mg, 0.55 mmol) and 2 N aq. LiOH solution (0.55 mL, 1.10 mmol) and the mixture was stirred at 160° C. for 1.5 h under microwave irradiation. After cooling to RT, THF was then removed at 40° C. under vacuum and the residue was taken up in CH2Cl2 (50 mL), washed with brine (10 mL), dried over Na2SO4, filtered, and concentrated under vacuum. Purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 93:7) followed by a new purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 95:5) gave 27 mg of N-(2-(6-(cyclopropylmethoxy)-3-((1-ethyl-3-hydroxy-6,7-dimethoxyisoquinolin-4-yl)methyl)quinolin-2-ylamino)ethyl)acetamide. 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 0.149 M HCl solution in MeOH (2.0 mL). The reaction mixture was stirred for 5 min at RT and concentrated at 40° C. under vacuum to give N-(2-(6-(cyclopropylmethoxy)-3-((1-ethyl-3-hydroxy-6,7-dimethoxyisoquinolin-4-yl)methyl)quinolin-2-ylamino)ethyl)acetamide dihydrochloride 87 as a brown solid (28.9 mg, 8% yield).

Provenance & Evidence