反应详情

A mixture of 2-ethyl-2H-pyrazole-3,4-dicarboxylic acid 4-ethyl ester (Example 10, steps 1-3, 3 g, 15 mmol) and thionyl chloride (40 ml) was heated to reflux (4 h). The thionyl chloride was evaporated, and the residue (3.38 g, 64%) was used in the next step without further purification.

1. temperaturewas heated
2. temperatureto reflux (4 h)
3. customThe thionyl chloride was evaporated
4. customthe residue (3.38 g, 64%) was used in the next step without further purification