重氮甲烷 、
3-oxo-(4at,7at)-1,3,4,4a,7,7a-hexahydro-1r,4c-etheno-cyclopenta[c]pyran-9-carboxylic acid 以
甲醇 为溶剂,
生成 (3aΞ,4
RS)-9-oxo-(4a
c,7a
c,8a
c')-4,4a,5,7a,8,8a-hexahydro-3
H-4
r,8
c-oxaethano-cyclopenta[
f]indazole-3a
r'-carboxylic acid methyl ester