2-[(5,6-Dimethyl-pyridin-2-ylamino)-methylene]-malonic acid diethyl ester 以
二苯醚 为溶剂,
以to yield 7.21 g of 6,7-Dimethyl-4-oxo-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid ethyl ester的产率得到6,7-dimethyl-4-oxo-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid ethyl ester