乙酸酐 、 (+/-)-2R
*,11bS
*-9,10-Dimethoxy-3'-phenyl-1,3,4,6,7,11b-hexahydrospiro
quinolizin-2,5'-imidazolidine>-2',4'-dione hydrochloride 反应 9.0h,
以86%的产率得到(+/-)-2R*,11bS*-1'-Acetyl-3'-phenyl-9,10-dimethoxy-1,3,4,6,7,11b-hexahydrospiroquinolizin-2,5'-imidazolidine>-2',4'-dione