2-[3-(3-cyclopropyl[1,2,4]oxadiazol-5-yl)-4,7-dihydro-5H-thieno[2,3-c]pyran-2-ylcarbamoyl]cyclopent-1-enecarboxylic acid 、
Methyl-hydrogen bicyclo<3.1.0>hexan-1.5-dicarboxylat 在
silica gel 、 ethyl acetate heptane 作用下,
生成 Methyl (1RS,5SR)-1-[[3-(3-cyclopropyl-1,2,4-oxadiazol-5-yl)-5,7-dihydro-4H-thieno[2,3-c]pyran-2-yl]carbamoyl]bicyclo[3.1.0]hexane-5-carboxylate