反应详情

Pyrazole (18 mmol) was added to a solution of 2-chloro-2-methoxycarbonylthiophene-3(2H)-one in acetic acid (10 ml). The mixture was allowed to stand at room temperature for 2 days and the precipitate filtered, m.p. 162°-164° C. (acetic acid).

1. filtrationthe precipitate filtered