4-chloro-3-cyano-5-methoxy-pyrrolo[1,2-b]pyridazine-6-carboxylic acid ethyl ester 、
4-氨基二苯醚 、 4-{4-[2-(1-tert-butoxycarbonyl-1-methyl-ethoxy)phenoxy]-phenylamino}-3-cyano-5-methyl-pyrrolo[1,2-b]pyridazine-6-carboxylicacid methyl ester 、 3-cyano-4-hydroxy-5-methoxy-pyrrolo[1,2-b]pyridazine-6-carboxylic acid ethyl ester 在
3-Cyano-5-methoxy-4-(4-phenoxy-phenylamino)-pyrrolo[1,2-b]pyridazine-6-carboxylic acid ethyl ester 作用下,
以0.28 g of 393 was obtained in 49% yield for 3 steps from 393F的产率得到3-Cyano-5-methoxy-4-(4-phenoxy-phenylamino)-pyrrolo[1,2-b]pyridazine-6-carboxylic acid ethyl ester