4-cyano-5-ethyl-3-(4-methanesulfonyloxymethyl-phenyl)-1-methyl-1H-pyrrole-2-carboxylic acid ethyl ester 、
1,2,5-噻二唑啉 1,1-二氧化物 在
potassium carbonate 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
生成 4-cyano-3-[4-(1,1-dioxo-1λ
6-[1,2,5]thiadiazolidin-2-ylmethyl)-phenyl]-5-ethyl-1-methyl-1H-pyrrole-2-carboxylic acid ethyl ester