反应详情

A mixture of 4,7-dihydro-4,7-dioxo-6-ethoxy-1-ethyl-1H-cyclohepta[b]pyridine-2-carboxylic acid ethyl ester (8.2 g, described in Example 7) and 19% hydrochloric acid (246 ml) is refluxed for 30 min and cooled to room temperature. The crystalline precipitate is collected and washed with water to give the title compound, mp 227°-228° C.

1. temperatureis refluxed for 30 min
2. customThe crystalline precipitate is collected
3. washwashed with water