反应详情

A solution of 3-Carboxy-1-ethyl-4-oxo-1,4-dihydro-[1,3]dioxolo[4,5-g]cinnoline-5-diazonium chloride (1.85 g, 5.68 mmol) in sulfuric acid (19.98 ml, 187 mmol) was heated at 95° C. for 20 h. Water was added, the precipitates were collected to provide 5-chloro-1-ethyl-6,7-dihydroxy-4-oxo-1,4-dihydrocinnoline-3-carboxylic acid (1.46 g, 5.13 mmol, 90% yield). LCMS: (M+H)+: 285.2

1. customthe precipitates were collected