反应详情

18.9 g. (57.4 mmol) (±)-7-Hydroxy-6-methoxy-1-(3,4-dimethoxybenzyl)-1,2,3,4-tetrahydroisoquinoline are dissolved at 60° C. in 70 ml. methanol and mixed with a solution of 9.94 g. (57.4 mmol) N-acetyl-L-leucine in 50 ml. methanol, also heated to 60° C. The solution obtained is concentrated by evaporating in a vacuum. After the addition of isopropanol/diethyl ether and recrystallisation from the same solvent mixture, there is obtained the N-acetyl-L-leucinate of (-)-7-hydroxy-6-methoxy-1-(3,4-dimethoxybenzyl)-1,2,3,4-tetrahydroisoquinoline; m.p. 179°-186° C.

1. customThe solution obtained
2. concentrationis concentrated
3. customby evaporating in a vacuum
4. additionAfter the addition of isopropanol/diethyl ether and recrystallisation from the same solvent mixture