This invention relates to a process for the preparation of pyrido[2,1-a] isoquinoline derivatives of the formula
wherein R
1
, R
2
, R
3
and R
4
are defined in the specification, comprising the optical resolution of an enamine of the formula
wherein R
1
is lower alkyl, in the presence of an optical active resolving agent to form an (S)-enamine salt of the formula
wherein RCO
2
−
is the conjugate base of the resolving agent.
本发明涉及一种制备式为pyrido [2,1-a] isoquinoline衍
生物的过程,其中R1、R2、R3和R4在说明书中定义,包括在光学活性分离剂的存在下对式为的烯胺进行光学分辨,以形成式为的(S)-烯胺盐,其中RCO2-是分离剂的共轭碱基。