3-Cyano-5-hydroxymethyl-4-(4-phenoxy-phenylamino)-pyrrolo[1,2-b]pyridazine-6-carboxylic acid ethyl ester 在
二氧化锰 silica gel 、
ethyl acetate dichloromethane 作用下,
以
氯仿 为溶剂,
反应 16.0h,
以to give compound 18 as a yellow solid (20 mg, 94%)的产率得到3-Cyano-5-formyl-4-(4-phenoxy-phenylamino)-pyrrolo[1,2-b]pyridazine-6-carboxylic acid ethyl ester