重氮甲烷 、
2-Acetyl-6-imino-5-(4-methoxy-benzoyl)-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89%的产率得到2-Acetyl-5-(4-methoxy-benzoyl)-3-methyl-6-[(E)-methylimino]-5,6-dihydro-pyrazolo[5,1-b]thiazole-7-carboxylic acid ethyl ester