trimethoxonium tetrafluoroborate 、
1,6-Dimethyl-5-oxo-7-phenyl-1,4,5,7a-tetrahydro-indazole-3a,4-dicarboxylic acid dimethyl ester 以
丙酮 为溶剂,
反应 0.25h,
以31%的产率得到(1R,2R,3R)-3-(N'-Formyl-N,N'-dimethyl-hydrazino)-5-methyl-6-oxo-4-phenyl-cyclohex-4-ene-1,2-dicarboxylic acid dimethyl ester