9,10-dimethoxy-1,3,4,6,7,11b-hexahydrospiro-2',5'(4'H)-dione hydrochloride 、
正丁胺 在
molecular sieve 作用下,
以
xylene 为溶剂,
以52.7%的产率得到1'-butyl-9,10-dimethoxy-1,3,4,6,7,11b-hexahydrospiro[pyrido[2,1-a]isoquinoline-2,3'-pyrrolidine]-2',5'-dione hydrochloride