6-[4-(2-tert.-butoxycarbonylamino)ethylamino-3-nitro-phenyl]-4,5-dihydro-5-methyl-3(2H)-pyridazinone 以
甲醇 、 palladium charcoal 、
二氯甲烷 为溶剂,
以1.6 g (69%)的产率得到6-[3-amino-4-(2-tert.-butoxycarbonylamino)ethylaminophenyl]-4,5-dihydro-5-methyl-3(2H)-pyridazinone