4'-(5-ethyl-1,3,4-oxadiazol-2-yl)-2'-methylbiphenyl-4-carboxylic acid 、
1'-methyl-2,3,6,7-tetrahydrospiroindole-3,4'-piperidine> 以54%的产率得到5-[4'-(5-Ethyl-1,3,4-oxadiazol-2-yl)-2'-methylbiphenyl-4-carbonyl]-1'-methyl-2,3,6,7-tetrahydrospiro[furo[2,3-f]indole-3,4'-piperidine]