Water → HCID 178437786, compound

Participants

Reaction Steps

To a stirred solution of 4-(3-bromobenzyl)-1-ethyl-6,7-dimethoxyisoquinolin-3-ol SLA 28138 (79 mg, 0.196 mmol) in EtOH (0.9 mL) in a 20 mL microwave vial equipped with a magnetic stirrer were added 4-methoxyphenylboronic acid (60 mg, 0.393 mmol), Pd(PPh3)2Cl2 (10.0 mg), a 2 N aq. Na2CO3 solution (0.3 mL), H2O (2.7 mL) and dimethoxyethane (3.5 mL) and the resulting mixture was stirred at 140° C. for 25 min. After cooling to RT, the mixture was diluted with EtOAc (30 mL) and the organic solution was passed through a celite plug, then washed with brine (10 mL). The celite plug was then further washed with CH2Cl2 (50 mL) and the organic layer was washed with brine (20 mL). The combined organic layers were dried over Na2SO4, filtered, and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 98:2) gave 1-ethyl-6,7-dimethoxy-4-((4′-methoxy-[1,1′-biphenyl]-3-yl)methyl)isoquinolin-3-ol. 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 (3 mL). The reaction mixture was stirred for 5 min at RT and concentrated at 40° C. under vacuum to afford 1-ethyl-6,7-dimethoxy-4-((4′-methoxy-[1,1-biphenyl]-3-yl)methyl)isoquinolin-3-ol hydrochloride 9 as a yellow solid (55 mg, 60% yield).

Provenance & Evidence