7-[
trans-2-(5-nitro-furan-2-yl)-vinyl]-4-oxo-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid 、 alkaline earth salt of/the/ methylsulfuric acid 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成
1-methyl-7-[trans-2-(5-nitro-furan-2-yl)-vinyl]-4-oxo-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid