The present invention discloses an improved process for preparation of substantially pure pentamethylene bis(1-(3,4-dimethoxybenzyl)-3,4-dihydro-6,7- dimethoxy-1H-isoquinoline-2-propionate), a compound of formula I and its acid addition salts in good yields. Pentamethylene bis(1-(3,4-dimethoxybenzyl)-3,4- dihydro-6,7-dimethoxy-1H-isoquinoline-2-propionate) or its acid addition salts is the key intermediate for the synthesis of a non-depolarizing neuromuscular-blocking drugs. The process can also be used for the synthesis of various tetrahydroisoquinoline derivatives.
本发明公开了一种改进的工艺,用于制备
化学纯度高的戊亚甲基双(1-(3,4-二
甲氧基苯甲基)-3,4-二氢-6,7-二甲氧基-1H-
异喹啉-2-
丙酸酯)化合物I及其良好产率的酸盐。戊亚甲基双(1-(3,4-二
甲氧基苯甲基)-3,4-二氢-6,7-二甲氧基-1H-
异喹啉-2-
丙酸酯)或其酸盐是合成非去极化神经肌肉阻滞药物的关键中间体。该工艺还可用于合成各种
四氢异喹啉衍
生物。