重氮甲烷 、
5-Chlor-6-<2,4-dinitro-phenylmercapto>-7-oxa-bicyclo<2,2,1>hepten-2-dicarbonsaeu-re-(2,3)-dimethylester 以
乙醚 为溶剂,
生成 5
t-chloro-6
c-(2,4-dinitro-phenylsulfanyl)-4,5,6,7-tetrahydro-3
H-4
r,7
c-epioxido-indazole-3a
t,7a
t-dicarboxylic acid dimethyl ester