反应详情

Into a 50-mL 3-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed 5-hydroxy-6-methoxy-1,2,3,4-tetrahydroisoquinolin-1-one (700 mg, 3.62 mmol, 1.00 equiv), Cs2CO3 (2.36 g, 7.22 mmol, 2.00 equiv), ethanol (20 mL) and (bromomethyl)benzene (740 mg, 4.35 mmol, 1.20 equiv). The resulting solution was heated to reflux for 1 hr. The solids were filtered out. The resulting mixture was concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (1:1). This resulted in 1 g (97%) of 5-(benzyloxy)-6-methoxy-1,2,3,4-tetrahydroisoquinolin-1-one as a gray solid. 1H NMR (300 MHz, DMSO-d6) δ: 2.70-2.75 (t, 2H), 3.19-3.23 (t, 2H), 3.90 (s, 3H), 4.95 (s, 2H), 7.05-7.08 (m, 1H), 7.33-7.42 (m, 5H), 7.62-7.64 (m, 1H), 7.70 (S, 1H); MS (ESI) m/z 284 ([M+H]+).

1. customInto a 50-mL 3-necked round-bottom flask purged
2. temperaturemaintained with an inert atmosphere of nitrogen
3. temperatureThe resulting solution was heated
4. temperatureto reflux for 1 hr
5. filtrationThe solids were filtered out
6. concentrationThe resulting mixture was concentrated under vacuum
7. customThis resulted in 1 g (97%) of 5-(benzyloxy)-6-methoxy-1,2,3,4-tetrahydroisoquinolin-1-one as a gray solid