Tetrahydrofuran → 8-Methoxy-1,2,3,4-tetrahydroisoquinoline

Participants

Reaction Steps

Combine 8-Methoxy-3,4-dihydro-2H-isoquinolin-1-one (0.778 g, 4.40 mmol), THF (20 ml), and LiAlH4 (0.333 g, 8.8 mmol) at 0° C. under nitrogen atmosphere. After 30 minutes the reaction, reflux for 2 hours and then cool to room temperature. Quench the reaction by adding water and 1M NaOH at 0° C. and stirring for 12 hours at room temperature. Filter the reaction through celite and elute with THF. After concentrating the filtrate under reduced pressure, add the mixture to a 10 g SCX column pre-treated with 5% AcOH/MeOH. After rinsing several times with MeOH, elute the product using 1N NH3-MeOH followed by concentration under reduced pressure to afford 0.665 g, 4.07 mmol (93% yield) of the title compound as a tan oil: 1H NMR (500 MHz, CDCl3); 1.7-2.0 (1H, b s), 2.77 (2H, t, J=5.86), 3.09 (2H, t, J=5.86), 3.8 (3H, s), 3.95 (2H, s), 6.6-6.8 (2H, m), 7.0-7.15 (1H, m); TLC 5% MeOH: Ethyl acetate Rf:=0.1

Provenance & Evidence