(S)-3-{(4-Fluoro-benzyl)-[2-(1-methyl-7-nitro-1-oxo-1lambda6 benzo[1,2,4]thiadiazin-3-yl)-acetyl]-amino}-pentanoic acid methyl ester 、
sodium ethanolate 在
crude product 、
盐酸 、
乙酸乙酯 、 Brine 、
magnesium sulfate 、
6-(S)-ethyl-1-(4-fluoro-benzyl)-4-hydroxy-3-(1-methyl-7-nitro-1-oxo-1λ6-benzo[1,2,4]thiadiazin-3-yl)-5,6-dihydro-1H-pyridin-2-one 作用下,
以
乙醇 为溶剂,
反应 2.5h,
以to afford the desired product, 6-(S)-ethyl-1-(4-fluoro-benzyl)-4-hydroxy-3-(1-methyl-7-nitro-1-oxo-1λ6-benzo[1,2,4]thiadiazin-3-yl)-5,6-dihydro-1H-pyridin-2-one (73), which的产率得到6-(S)-ethyl-1-(4-fluoro-benzyl)-4-hydroxy-3-(1-methyl-7-nitro-1-oxo-1λ
6-benzo[1,2,4]thiadiazin-3-yl)-5,6-dihydro-1H-pyridin-2-one