Water → HCID 13306691, compound

Participants

Reaction Steps

3-Amino-1-(3-trifluoromethylphenyl)-2-pyrazoline (1.907 g) was dissolved in formic acid (20 ml). The solution was stirred at 60° and acetic anhydride (2.4 ml) was added dropwise. The mixture was heated for 1 hour at 60° and then poured into water and stirred to decompose the residual excess anhydride. 3-Formamido-1-(3-trifluoromethylphenyl)-2-pyrazoline resulted as a crystalline solid m.p. 128°-129°. This compound was then used to prepare the compound of Example 1, as hereinbefore described.

Provenance & Evidence