重氮甲烷 、
2-Acetyl-5-benzoyl-6-imino-3-methyl-5,6-dihydro-pyrazolo[5,1-b]thiazole-7-carboxylic acid ethyl ester 以
1,4-二氧六环 、
乙醚 为溶剂,
以91%的产率得到2-Acetyl-5-benzoyl-3-methyl-6-[(E)-methylimino]-5,6-dihydro-pyrazolo[5,1-b]thiazole-7-carboxylic acid ethyl ester