7-[2-(1,1-dioxo-1lambda*6*-[1,2]thiazinan-2-ylmethyl)-4-fluoro-benzyl]-4-hydroxy-1-methyl-2-oxo-1,2-dihydro-[1,5]naphthyridine-3-carboxylic acid ethyl ester 、
乙酸酐 反应 2.0h,
以61%的产率得到4-acetoxy-7-[2-(1,1-dioxo-1lambda*6*-[1,2]thiazinan-2-ylmethyl)-4-fluoro-benzyl]-1-methyl-2-oxo-1,2-dihydro-[1,5]naphthyridine-3-carboxylic acid ethyl ester