反应详情

温度

150 °C

To a solution of 1-ethyl-6,7-dimethoxyisoquinolin-3-ol SLA 28136 (50 mg, 214 μmol) in toluene (10 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added a 2 N aq. KOH solution (0.11 mL, 0.22 mmol) at RT followed by 2-(chloromethyl)dibenzo[b,d]furan CCH 34116-2 (47 mg, 217 μmol) and the mixture was stirred at 150° C. for 1.5 h under microwave irradiation. After cooling to RT, the mixture was diluted with a mixture CH2Cl2:MeOH=9:1 (50 mL), washed with brine (10 mL), dried over Na2SO4, filtered and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 96:4) gave 4-(dibenzo[b,d]furan-2-ylmethyl)-1-ethyl-6,7-dimethoxyisoquinolin-3-ol (10 mg, 11%). 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 0.2 M HCl solution in MeOH (0.25 mL). The reaction mixture was stirred for 5 min at RT and concentrated at 40° C. under vacuum to afford 4-(dibenzo[b,d]furan-2-ylmethyl)-1-ethyl-6,7-dimethoxyisoquinolin-3-ol hydrochloride 6 as a pale brown solid (11 mg, 11% yield).

1. temperatureAfter cooling to RT
2. washMeOH=9:1 (50 mL), washed with brine (10 mL)
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated at 40° C. under vacuum
6. customPurification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 96:4)