反应详情

Acetyl chloride (30 mL, 33 g, 422 mmol) was added carefully to ice-cold anhydrous EtOH and the resulting solution was stirred at RT for 10 min. 6-Hydroxy-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid (3.30 g, 14 mmol) was added and the mixture was stirred at 50° C. for 5 h. The solvent was evaporated and the residue was dried under vacuum to yield ethyl 6-hydroxy-1,2,3,4-tetrahydroisoquinoline-3-carboxylate (4.35 g, crude yield>100%) as a yellow solid. MS expected 222.1 found 222.0. 1H NMR (400 MHz, CD3OD): δ 7.06 (d, J=8.4 Hz, 1H), 6.74 (dd, J=8.0, and 2.4 Hz, 1H), 6.69 (d, J=2.4 Hz, 1H), 4.44-4.29 (m, 5H), 3.35 (dd, J=17.2, and 5.2 Hz, 1H), 3.15 (dd, J=17.2, and 11.6 Hz, 1H), 1.35 (t, J=7.2 Hz, 3H).

1. stirringthe mixture was stirred at 50° C. for 5 h
2. customThe solvent was evaporated
3. customthe residue was dried under vacuum