6'-fluoro-4',9'-dihydro-N-ethyl-N-methyl-4-butyl-spiro[cyclohexane-1,1'(3'H)-pyrano[3,4-b]indol]-4-amine 、
柠檬酸 以
异丙醇 为溶剂,
以37%的产率得到6'-fluoro-4',9'-dihydro-N-ethyl-N-methyl-4-butyl-spiro[cyclohexane-1,1'(3'H)-pyrano[3,4-b]indol]-4-amine 2-hydroxy-1,2,3-propanetricarboxylate